【简答题】流体在一段圆形水平直管内流动,测得平均流速为 0.5m/s,压强降为10Pa,Re为1000,则管中心处点流速为 m/s;若平均流速变为1m/s,则压强降为 Pa。(保留两位有效数字)
【单选题】I would have helped you,but I ________ the whole week.
D.
will be really occupied
【简答题】流体在一段圆形水平直管中流动,测得平均流速为0.5m/s,压强降为10Pa,Re为1000,问管中心处点速度为____m/s,若平均流速增加为1m/s,则压强降为____Pa
【简答题】I really enjoyed this movie. It's a fun move for the whole family. I had really good laughs and enjoyed being there. -- James I would recommend (推荐)this...
【单选题】---- What an interesting film it is! I really enjoyed it! ----________. I really fell asleep.
【单选题】.---Ugh! I’m really cold then really hot,then cold again.I’m getting the flu. -----__________? Maybe you should go home and get some sleep.
【简答题】In spite of all you say, I ______ think I am right. A) do really B) did really C) really do D) really did
【简答题】I really enjoyed this movie. It’s a fun movie for the whole family. I had really good laughs and enjoyed being there. —-—-James I’ve seen sev...
【单选题】—I think the decorations of the bed designed for children are really fancy. —______. I really want to buy one for my son.
【简答题】流体在一段圆形水平直管中流动,测得平均流速为 1 m/s ,压强降为 15 Pa ,雷诺数为 620 ,则管中心处速度为 _______ m/s ;若平均流速增加为 3 m/s ,则压强降为 _______Pa 。