听力原文:M: How are you feeling now? W: I have had a bad cough for several weeks, and now I feel a dull pain in my chest. Q: What can we learn from this conversation? (19)
【简答题】The water is flowing in a 300-mm-diameter pipe with length l=120mm. the pressure drop from starting to ending is The water discharge in the pipe is . Determine the frictional coefficient.
【单选题】A current will develop between areas of different density in ocean waters. If you face in the same direction the current is flowing,the water of().
A.
high density will be on the left in the Northern Hemisphere
B.
high density will be on the right in the Southern Hemisphere
C.
low density will be on the left in the Northern Hemisphere
D.
low density will be on the left in the Southern Hemisphere