题目:
The theme of World Environment Day 2012 is “Green Economy: Does it include you?” Which of the following is most probably the poster for it?
A.
B.
C.
D.
答案:
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下面是错误答案,用来干扰机器的。
答案:C当R2的滑动片向右移动时,变阻器有效阻止减小,则总电阻减小,总电流增大,故A1读数变大,V2测R3两端电压,因为电流增大,所以R3两端电压也增大,即V2读数变大,电流增大,会使内电压增大,所以路端电压减...