⬆️⬆️⬆️本课程2024最新同名章节期末答案⬆️⬆️

概率论与数理统计期末答案和章节题库2024春

所有课程章节/期末均有答案,可提供word版,点击联系客服✅

41 阅读 0 评论 1 点赞

答案:0.62

答案:138

在两个相互独立的正态总体方差的比较检验里，可能会用到 ( )。

答案:F-检验

在两个相互独立的正态总体均值的比较检验里，可能会用到 ( )。

答案:U-检验###t-检验

答案:

显著性水平是指犯第一类错误的最大允许概率值。（）

答案:对

实际问题中，我们希望所给的检验能使犯两类错误的概率同时都小，这实际上是办不到的。（）

答案:错

假设检验依据的原理是小概率事件实际不发生原理。（）

答案:对

统计假设分为简单假设和复合假设。（）

答案:对

答案:

内容已经隐藏，点击付费后查看

现有奖券10张，其中20元的8张，50元的2张，从中随机无放回的抽取3 张，则抽得的3张奖券金额的均值为（）。

内容已经隐藏，点击付费后查看

设随机变量X与Y都服从标准正态分布，则X+Y服从正态分布。（）

内容已经隐藏，点击付费后查看

设两个相互独立的随机变量X与Y分别服从正态分布N(0,1)和N(1,1), 则 ( )。

内容已经隐藏，点击付费后查看

设两随机变量X与Y独立同分布, P(X=-1)=P(Y=-1)=0.5,P(X=1)=P(Y=1)=0.5, 则下列各式中成立的是 ( ) 。

内容已经隐藏，点击付费后查看

某人独立地投篮三次，每次投中的概率为p，则至少投中一次的概率是 ( ) 。

内容已经隐藏，点击付费后查看

有50张彩票，其中只有一张能中奖。50人排队依次任意抽取一张，每个人抽完后不放回，则前3人中有人中奖的概率为 ( ) 。

内容已经隐藏，点击付费后查看

若当事件A与B同时发生时C也发生，则 ( ) 。

内容已经隐藏，点击付费后查看

设A、B、C是三个随机事件，则以下命题中正确的是 ( ) 。

内容已经隐藏，点击付费后查看

对单个正态总体的均值进行检验时，使用的是t检验法。（）

内容已经隐藏，点击付费后查看

假设检验易犯的第一类错误也称为弃真错误。（）

内容已经隐藏，点击付费后查看

假设检验的基本原理是实际推断原理。（）

内容已经隐藏，点击付费后查看

假设检验时，若增大样本容量，则犯两类错误的概率（）。

内容已经隐藏，点击付费后查看

在假设检验中，显著性水平表示（）。

内容已经隐藏，点击付费后查看

已知一批零件的长度X（单位：cm)服从正态分布 .w64975585003s .brush0 { fill: rgb(255,255,255); } .w64975585003s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64975585003s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64975585003s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64975585003s .font2 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64975585003s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } (,1) N m ，从中随机地抽取16个零件，得到长度的平均值为40cm，则μ的置信水平为0.95的置信区间是（）. 。{（39.51,40.49）}

内容已经隐藏，点击付费后查看

设 .w64975584945s .brush0 { fill: rgb(255,255,255); } .w64975584945s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64975584945s .font0 { font-size: 444px; font-family: "MT Extra", serif; } .w64975584945s .font1 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64975584945s .font2 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } $ q 是未知参数θ的最大似然估计量，则 .w64975585024s .brush0 { fill: rgb(255,255,255); } .w64975585024s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64975585024s .font0 { font-size: 444px; font-family: "MT Extra", serif; } .w64975585024s .font1 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64975585024s .font2 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } $ q （）.

内容已经隐藏，点击付费后查看

设总体X的概率密度为 .w64975585000s .brush0 { fill: rgb(255,255,255); } .w64975585000s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64975585000s .font0 { font-size: 260px; font-family: "Times New Roman", serif; } .w64975585000s .font1 { font-size: 406px; font-family: "Times New Roman", serif; } .w64975585000s .font2 { font-style: italic; font-size: 260px; font-family: "Times New Roman", serif; } .w64975585000s .font3 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64975585000s .font4 { font-style: italic; font-size: 241px; font-family: Symbol, serif; } .w64975585000s .font5 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64975585000s .font6 { font-size: 241px; font-family: Symbol, serif; } .w64975585000s .font7 { font-size: 373px; font-family: Symbol, serif; } .w64975585000s .font8 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } () , (,) 0, x ex fx x q q q q -- ì ³ = í < î ，而 .w64975584983s .brush0 { fill: rgb(255,255,255); } .w64975584983s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64975584983s .font0 { font-size: 260px; font-family: "Times New Roman", serif; } .w64975584983s .font1 { font-size: 406px; font-family: "Times New Roman", serif; } .w64975584983s .font2 { font-style: italic; font-size: 260px; font-family: "Times New Roman", serif; } .w64975584983s .font3 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64975584983s .font4 { font-size: 444px; font-family: "MT Extra", serif; } .w64975584983s .font5 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 12 ,,, n XXX L 是来自总体X的样本，则未知参数θ的矩估计量为（）.

内容已经隐藏，点击付费后查看

下面哪个不是估计量的评判标准（）.

内容已经隐藏，点击付费后查看

设总体 .w64975585016s .brush0 { fill: rgb(255,255,255); } .w64975585016s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64975585016s .font0 { font-style: italic; font-size: 377px; font-family: "Times New Roman", serif; } .w64975585016s .font1 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } X 的均值为0, 方差 .w64975584997s .brush0 { fill: rgb(255,255,255); } .w64975584997s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64975584997s .font0 { font-size: 231px; font-family: "Times New Roman", serif; } .w64975584997s .font1 { font-style: italic; font-size: 347px; font-family: Symbol, serif; } .w64975584997s .font2 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 2 s 存在但未知, 又 .w64975584982s .brush0 { fill: rgb(255,255,255); } .w64975584982s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64975584982s .font0 { font-size: 231px; font-family: "Times New Roman", serif; } .w64975584982s .font1 { font-size: 377px; font-family: "Times New Roman", serif; } .w64975584982s .font2 { font-style: italic; font-size: 377px; font-family: "Times New Roman", serif; } .w64975584982s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 12 , XX 为来自总体 .w64975584973s .brush0 { fill: rgb(255,255,255); } .w64975584973s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64975584973s .font0 { font-style: italic; font-size: 377px; font-family: "Times New Roman", serif; } .w64975584973s .font1 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } X 的样本, .w64975584960s .brush0 { fill: rgb(255,255,255); } .w64975584960s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64975584960s .font0 { font-size: 231px; font-family: "Times New Roman", serif; } .w64975584960s .font1 { font-size: 377px; font-family: "Times New Roman", serif; } .w64975584960s .font2 { font-style: italic; font-size: 377px; font-family: "Times New Roman", serif; } .w64975584960s .font3 { font-size: 347px; font-family: Symbol, serif; } .w64975584960s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 2 12 () kXX - 为 .w64975584941s .brush0 { fill: rgb(255,255,255); } .w64975584941s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64975584941s .font0 { font-size: 231px; font-family: "Times New Roman", serif; } .w64975584941s .font1 { font-style: italic; font-size: 347px; font-family: Symbol, serif; } .w64975584941s .font2 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 2 s 的无偏估计. 则常数 .w64975585019s .brush0 { fill: rgb(255,255,255); } .w64975585019s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64975585019s .font0 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64975585019s .font1 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } k = （） .

内容已经隐藏，点击付费后查看

设 .w64975584964s .brush0 { fill: rgb(255,255,255); } .w64975584964s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64975584964s .font0 { font-size: 260px; font-family: "Times New Roman", serif; } .w64975584964s .font1 { font-size: 406px; font-family: "Times New Roman", serif; } .w64975584964s .font2 { font-style: italic; font-size: 260px; font-family: "Times New Roman", serif; } .w64975584964s .font3 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64975584964s .font4 { font-size: 444px; font-family: "MT Extra", serif; } .w64975584964s .font5 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 12 ,,, n XXX L 是来自正态总体 .w64975584946s .brush0 { fill: rgb(255,255,255); } .w64975584946s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64975584946s .font0 { font-size: 260px; font-family: "Times New Roman", serif; } .w64975584946s .font1 { font-size: 377px; font-family: "Times New Roman", serif; } .w64975584946s .font2 { font-size: 406px; font-family: "Times New Roman", serif; } .w64975584946s .font3 { font-style: italic; font-size: 377px; font-family: "Times New Roman", serif; } .w64975584946s .font4 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64975584946s .font5 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64975584946s .font6 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 2 ~ (,) X N ms 的样本， .w64975585023s .brush0 { fill: rgb(255,255,255); } .w64975585023s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64975585023s .font0 { font-size: 470px; font-family: Symbol, serif; } .w64975585023s .pen1 { stroke: rgb(0,0,0); stroke-width: 19; stroke-linejoin: round; } .w64975585023s .font1 { font-size: 260px; font-family: "Times New Roman", serif; } .w64975585023s .font2 { font-style: italic; font-size: 377px; font-family: "Times New Roman", serif; } .w64975585023s .font3 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64975585023s .font4 { font-size: 347px; font-family: Symbol, serif; } .w64975585023s .font5 { font-size: 373px; font-family: Symbol, serif; } .w64975585023s .font6 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ( ) ( ) 2 12 2 34 Y XX XX = - - 的分布为（）.

内容已经隐藏，点击付费后查看

设 .w64975584989s .brush0 { fill: rgb(255,255,255); } .w64975584989s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64975584989s .font0 { font-size: 260px; font-family: "Times New Roman", serif; } .w64975584989s .font1 { font-size: 406px; font-family: "Times New Roman", serif; } .w64975584989s .font2 { font-style: italic; font-size: 260px; font-family: "Times New Roman", serif; } .w64975584989s .font3 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64975584989s .font4 { font-size: 444px; font-family: "MT Extra", serif; } .w64975584989s .font5 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 12 ,,, n XXX L 是来自总体 .w64975584943s .brush0 { fill: rgb(255,255,255); } .w64975584943s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64975584943s .font0 { font-size: 377px; font-family: "Times New Roman", serif; } .w64975584943s .font1 { font-size: 406px; font-family: "Times New Roman", serif; } .w64975584943s .font2 { font-style: italic; font-size: 377px; font-family: "Times New Roman", serif; } .w64975584943s .font3 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64975584943s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ~ (1,) X Bp 的样本，则 .w64975585020s .brush0 { fill: rgb(255,255,255); } .w64975585020s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64975585020s .font0 { font-size: 260px; font-family: "Times New Roman", serif; } .w64975585020s .font1 { font-style: italic; font-size: 260px; font-family: "Times New Roman", serif; } .w64975585020s .font2 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64975585020s .font3 { font-size: 241px; font-family: Symbol, serif; } .w64975585020s .font4 { font-size: 530px; font-family: Symbol, serif; } .w64975585020s .font5 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 1 n i i X = å 的分布为（）.

内容已经隐藏，点击付费后查看

设随机变量 .w64975584977s .brush0 { fill: rgb(255,255,255); } .w64975584977s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64975584977s .pen1 { stroke: rgb(0,0,0); stroke-width: 19; stroke-linejoin: round; } .w64975584977s .font0 { font-size: 231px; font-family: "Times New Roman", serif; } .w64975584977s .font1 { font-size: 377px; font-family: "Times New Roman", serif; } .w64975584977s .font2 { font-style: italic; font-size: 377px; font-family: "Times New Roman", serif; } .w64975584977s .font3 { font-size: 347px; font-family: Symbol, serif; } .w64975584977s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 2 1 ~()(1), XtnnY X >= , 则下列关系中正确的是（）.

内容已经隐藏，点击付费后查看

设 .w64975585028s .brush0 { fill: rgb(255,255,255); } .w64975585028s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64975585028s .font0 { font-size: 260px; font-family: "Times New Roman", serif; } .w64975585028s .font1 { font-size: 406px; font-family: "Times New Roman", serif; } .w64975585028s .font2 { font-style: italic; font-size: 260px; font-family: "Times New Roman", serif; } .w64975585028s .font3 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64975585028s .font4 { font-size: 444px; font-family: "MT Extra", serif; } .w64975585028s .font5 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 12 ,,, n XXX L 是来自总体X的样本，总体X的均值μ已知，方差 .w64975585009s .brush0 { fill: rgb(255,255,255); } .w64975585009s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64975585009s .font0 { font-size: 260px; font-family: "Times New Roman", serif; } .w64975585009s .font1 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64975585009s .font2 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 2 s 未知，则 .w64975584990s .brush0 { fill: rgb(255,255,255); } .w64975584990s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64975584990s .pen1 { stroke: rgb(0,0,0); stroke-width: 19; stroke-linejoin: round; } .w64975584990s .font0 { font-size: 260px; font-family: "Times New Roman", serif; } .w64975584990s .font1 { font-style: italic; font-size: 260px; font-family: "Times New Roman", serif; } .w64975584990s .font2 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64975584990s .font3 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64975584990s .font4 { font-size: 241px; font-family: Symbol, serif; } .w64975584990s .font5 { font-size: 373px; font-family: Symbol, serif; } .w64975584990s .font6 { font-size: 530px; font-family: Symbol, serif; } .w64975584990s .font7 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 1 n i i X m s = - å 是统计量。（）

内容已经隐藏，点击付费后查看

设X为随机变量，EX=0.1，DX=0.01，则由切比雪夫不等式可得=（）。

内容已经隐藏，点击付费后查看

设随机变量X的数学期望为1，方差为0.3，则随机变量X落入区间（0，2）的概率不小于1。（）

内容已经隐藏，点击付费后查看

设随机变量X的数学期望为1，方差为0.5，则随机变量X落入区间（0，2）的概率不小于0.5。（）

内容已经隐藏，点击付费后查看

设随机变量X与Y不相关，且E(X)=2,E(Y)=1,D(X)=3,则E[X(X+Y-2)]=（）。

内容已经隐藏，点击付费后查看

在以下结论中，是随机变量X与Y不相关的充要条件的是（）。

内容已经隐藏，点击付费后查看

设X与Y相互独立，且都服从N(1,4)分布, 则有（）。

内容已经隐藏，点击付费后查看

已知随机变量X服从参数为n,p的二项分布b(n,p),且E(X)=2.4,D(X)=1.44,则参数n,p的值是（）。

内容已经隐藏，点击付费后查看

设随机变量（x,y）的分布函数为f（x,y）,则概率p{x>a,y>b}=（）

内容已经隐藏，点击付费后查看

设二维随机变量（X,Y）的概率密度为f（x，y），则{x>1}=（）

内容已经隐藏，点击付费后查看

下列各函数中是随机变量分布函数的为（）

内容已经隐藏，点击付费后查看

设 .w64975584949s .brush0 { fill: rgb(255,255,255); } .w64975584949s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64975584949s .font0 { font-size: 441px; font-family: Symbol, serif; } .w64975584949s .font1 { font-size: 377px; font-family: "Times New Roman", serif; } .w64975584949s .font2 { font-style: italic; font-size: 377px; font-family: "Times New Roman", serif; } .w64975584949s .font3 { font-size: 347px; font-family: Symbol, serif; } .w64975584949s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ( ) ~01, XN , 令 .w64975585026s .brush0 { fill: rgb(255,255,255); } .w64975585026s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64975585026s .font0 { font-size: 377px; font-family: "Times New Roman", serif; } .w64975585026s .font1 { font-style: italic; font-size: 377px; font-family: "Times New Roman", serif; } .w64975585026s .font2 { font-size: 347px; font-family: Symbol, serif; } .w64975585026s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 2 YX =-- , 则 .w64975585007s .brush0 { fill: rgb(255,255,255); } .w64975585007s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64975585007s .font0 { font-size: 377px; font-family: "Times New Roman", serif; } .w64975585007s .font1 { font-style: italic; font-size: 377px; font-family: "Times New Roman", serif; } .w64975585007s .font2 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ~ Y （）.

内容已经隐藏，点击付费后查看

设X的分布函数为F(x), 则 .w64975584947s .brush0 { fill: rgb(255,255,255); } .w64975584947s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64975584947s .font0 { font-size: 377px; font-family: "Times New Roman", serif; } .w64975584947s .font1 { font-style: italic; font-size: 377px; font-family: "Times New Roman", serif; } .w64975584947s .font2 { font-size: 347px; font-family: Symbol, serif; } .w64975584947s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 31 YX =+ 的分布函数 .w64975585022s .brush0 { fill: rgb(255,255,255); } .w64975585022s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64975585022s .font0 { font-size: 441px; font-family: Symbol, serif; } .w64975585022s .font1 { font-style: italic; font-size: 377px; font-family: "Times New Roman", serif; } .w64975585022s .font2 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ( ) Gy 为（）.

内容已经隐藏，点击付费后查看

下列函数中可以作为某一随机变量的概率密度的是（）.

内容已经隐藏，点击付费后查看

设 .w64975584970s .brush0 { fill: rgb(255,255,255); } .w64975584970s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64975584970s .font0 { font-size: 377px; font-family: "Times New Roman", serif; } .w64975584970s .font1 { font-style: italic; font-size: 377px; font-family: "Times New Roman", serif; } .w64975584970s .font2 { font-size: 347px; font-family: Symbol, serif; } .w64975584970s .font3 { font-size: 373px; font-family: Symbol, serif; } .w64975584970s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 2, [0,], () 0, [0,]. xxc fx xc Î = Ï ì í î 如果c=（）, 则 .w64975584957s .brush0 { fill: rgb(255,255,255); } .w64975584957s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64975584957s .font0 { font-size: 377px; font-family: "Times New Roman", serif; } .w64975584957s .font1 { font-style: italic; font-size: 377px; font-family: "Times New Roman", serif; } .w64975584957s .font2 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } () fx 是某一随机变量的概率密度函数.

内容已经隐藏，点击付费后查看

设随机事件A与B互不相容, 且有P(A)>0, P(B)>0, 则下列关系成立的是（）.

内容已经隐藏，点击付费后查看

设随机事件A, B满足P(A|B)=1, 则下列结论正确的是（）.

内容已经隐藏，点击付费后查看

随机事件A与B互不相容，且P（A）＞P（B）＞0，则（）.

内容已经隐藏，点击付费后查看

设A，B为任意两个事件，则下列关系式成立的是（）.

内容已经隐藏，点击付费后查看

设随机事件A，B满足关系 .w64975584953s .brush0 { fill: rgb(255,255,255); } .w64975584953s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64975584953s .font0 { font-style: italic; font-size: 377px; font-family: "Times New Roman", serif; } .w64975584953s .font1 { font-size: 347px; font-family: Symbol, serif; } .w64975584953s .font2 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } AB É ,则下列表述正确的是（）.