第三章单元测试
- Consider the region
in the 
-plane. Compare the magnitudes of 
and 
. Then which one of the following is right? （ ）. - Let
, find 
（ ）. - Let
be a curve on the plane, the expression 
represents for a line integral of first type. （ ） - Let
be the region enclosed by 
and 
, then 
. （ ） - Let
be the solid enclosed by 
and 
, then 
. （ ）
A:
B:
C:
答案:
A:
B:
C:
答案:
A:错 B:对
答案:错
A:错 B:对
答案:错
A:错 B:对
答案:错
