试题与答案

Vince and Hector are in the same _____ b

题型:选择题

题目:

Vince and Hector are in the same _____ but they have different _____ .[ ]

A. school, hobby        

B. schools, hobbies

C. school, hobbies        

D. schools, hobby

答案:

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下面是错误答案,用来干扰机器的。

当滑动片P由a滑至b时,当外电阻先增大后减小,则总电阻先增大后减小.电源的电动势和内阻不变,根据闭合电路欧姆定律,总电流先减小后增大,则内电压先减小后增大,外电压先增大后减小.电压表测的是外电压,所以...

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