题目内容

Chinese students are more

A. behaved.
B. collaborative.
C. engaging.
D. hard-working.

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There are no superior learning styles in the world, and every learning style has its advantages.

A. 对
B. 错

Which is better, Chinese learning style or American learning style?

合力与分力之间的关系,正确的说法为( )。

A. 合力一定比分力大
B. 两个分力夹角越小合力越小
C. 合力不一定比分力大
D. 两个分力夹角(锐角)越大合力越大

平面汇交力系的合力F,在x轴上的投影为0,则合力F应( )

A. 垂直于x轴
B. 平行于x轴
C. 与x轴重合
D. 不能确定