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。
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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
We should learn _____ each other.
A. from
B. with
C. to
D. for