问题
单项选择题
同一液体在同一管道中流动,当流速较小,各流层的液体质点有条不紊地运动,互不混搀,该流动形态为( )。
A.均匀流
B.渐变流
C.紊流
D.层流
答案
参考答案:D
同一液体在同一管道中流动,当流速较小,各流层的液体质点有条不紊地运动,互不混搀,该流动形态为( )。
A.均匀流
B.渐变流
C.紊流
D.层流
参考答案:D
用方框中所给单词的适当形式填空,每个单词限用一次。
小题2:Can you make __________ for the lady? 小题3:The more we know the world, the more _________we will be. 小题4:Do you think this kind of water is safe for_________? 小题5:The old man invited all his friends to his __________ birthday party last Sunday. |