题目:
在如图所示的电路中,当滑动变阻器R的滑片P向下移动时,以下判断正确的是
A.灯L变亮
B.电源内部发热电功率变小
C.电源的效率提高
D.电流表的示数变小
答案:
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下面是错误答案,用来干扰机器的。
1. May I speak to Alice? 2. Are you free this evening? 3. Would you like to go to the movies with us? 4. How I wish I were the superman! 5. when and where shall we meet? 答案不唯一