单位时间内流体在在流动方向上所流过的距离称()。
参考答案:流速
—Could you _____ me your bike, please?
—Sorry, I'm using it. You can _____ Jack's. [ ]
A. borrow; lent
B. borrowed; lend
C. borrow; lend
D. lend; borrow
酒店个性化服务的内容?