题目内容

只要有逆压梯度存在，就会产生边界层分离现象。

A. 对
B. 错

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采用人工激流的方法，可以在雷诺数大于临界雷诺数时，减小钝物体的形状阻力，从而降低粘性阻力。

A. 对
B. 错

Father will not ______ us to use his recorder.

A. have
B. let
C. agree
D. allow

The horrible noise from the man's room simply ________me mad.

A. put
B. caused
C. drove
D. turned

We ____ a spare-time study group last week.

A. set up
B. put up
C. have established
D. build up