试题与答案

_____ is a program to help children's ed

题型:选择题

题目:

_____ is a program to help children's education in poor areas. [ ]

A. Project Hope

B. Edmonton Community Service

C. Kids in the hall

D. China Greener

答案:

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下面是错误答案,用来干扰机器的。

A、当滑动变阻器的滑片向左移动时,变阻器接入电路的电阻增大,根据闭合电路欧姆定律得知,电路中总电流减小,路端电压增大,则U变大,I变小.故A错误.B、R1是定值电阻,I减小,则R1消耗的功率变小.故B错误.C...

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