第二章测试1.The six free movements of the ocean moving body are longitudinal, transverse, vertical, pitch, roll and yaw. （ ）（海洋运动体的六自由运动分别为纵荡、横荡、垂荡、纵摇、横摇、艏摇。）
A:错 B:对
答案:B
2.The relative speed and flow speed working in the wake field behind the ship are affected by the hull. These effects can be roughly divided into three categories, namely effective aspect ratio, effective advance speed and effective Angle of attack.（ ）（在船后伴流场中工作的相对速度、流动速度都受船体影响。这些影响大致可以有三类，分别是有效展弦比、有效进速、有效攻角。）
A:对 B:错
答案:A
3.Many hydrodynamic test results of Marine rudders have been published in various countries. They have given hydrodynamic data for rudder of various profile forms, aspect ratio, thickness ratio, side projection shape, tip shape and sweep Angle. The most widely used section of the NACA series is often labeled NACA XYZZ. There are four Arabic digits after the Latin alphabet, the first two digits are , and for the symmetrical section, it is marked "00"; The last two digits are . （ ）（各国发表了许多船用舵的系列水动力试验结果。他们给出了各种剖面形式、展弦比、厚度比、侧投影形状、尖端形状、后掠角的舵的水动力资料。其中使用的最为广泛的NACA系列剖面，常标志为NACA XYZZ。其中拉丁字母后有四位阿拉伯数字，前两位为 ，对于对称型剖面记为“00”；后两位为 。）
A:Aspect ratio; Maximum lift coefficient（展弦比；最大升力系数） B: Camber ratio; Maximum lift coefficient（拱度比；最大升力系数） C:Aspect ratio; Percentage of thickness（展弦比；厚度百分数 ） D: camber ratio; Percentage thickness ratio（拱度比；厚度比百分数）
答案:D
4.The forces acting on a moving ship can be divided into three categories, namely, fluid force, main force (controlling force), and environmental disturbing force.（ ）（作用于运动中船舶上的力可分三类，即流体动力、主动力（控制力）、环境干扰力。）
A:对 B:错
答案:A
5.Flaps can be divided into trailing edge flaps and leading edge flaps according to the installation position and specific function. （ ）（依据所安装部位和具体作用的不同，襟翼可分为后缘襟翼、前缘襟翼。）
A:对 B:错
答案:A
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