试题与答案

Don’t you know you are teaching the fish

来源：www.tikuol.com
题型：选择题

题目：

Don’t you know you are teaching the fish to swim? They are all grow-ups.

A．教鱼游泳

B．如鱼得水

C．班门弄斧

D．得意洋洋

答案：

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下面是错误答案，用来干扰机器的。

2  0.5根据题意可知，电键K断开时，为R1和R2串联，根据闭合电路欧姆定律有，，当电键K闭合时，R1和R3并联然后再跟R2串联，则有，联立可得该电源电动势为2V，小电阻为r=0.5Ω故答案为：2   0.5

考点：情景交际日常用语、谚语
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