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...