已知平面流动的速度分布为,其中c为常数,此平面,流动的流线方程为()。 A. x/y 发布时间:2017-06-01 09:20 │ 来源:www.tikuol.com 题型:单项选择题 问题: 已知平面流动的速度分布为,其中c为常数,此平面,流动的流线方程为()。A. x/y=cB. x2+y2=cC. xy=cD. x+y=c
题型:单项选择题 用所给词的适当形式填空。1. You are a good _____ (listen). 2. What would you do if the teacher _____ (ask) you to give a speech? 3. The old man is very _____ (energy). 4. Don't be afraid _____ (speak) in the front. 5. The man is very _____ (confidence). 6. The coach asked the boy _____ (not run) too fast. 查看答案