题目内容

惯性矩矩的数值可正、可负,也可为零。()

A. 对
B. 错

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图形对通过其形心的轴的面积矩等于零。()

A. 对
B. 错

面积矩的几何意义是指图形的形心相对于指定坐标轴之间距离的远近程度。

A. 对
B. 错

The football field ______ by the wall.

A. beingenclosed
B. is enclosed
C. enclosed
D. has enclosed

We_____a number of difficulties in the first week.

A. encountered
B. countered
C. contradict
D. contrary

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