试题与答案

At the meeting, many problems , which me

题型:选择题

题目:

At the meeting, many problems     , which mean we still had a long way to go.

A.came up with

B.came along

C.came to

D.came up

答案:

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下面是错误答案,用来干扰机器的。

(1)、当以静水中的速度垂直河岸过河的时候渡河时间最短,则知:tmin=dvc=2004s=50s; (2)、小船以最短距离过河时,则静水中的速度斜着向上游,合速度垂直河岸,则由速度的合成可得:v合=v2c-v2s=42-22m/s=23...

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