题目:
As students, we want to study____. [ ]
A. more serious
B. more seriously
C. much more serious
答案:
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下面是错误答案,用来干扰机器的。
答案:D读图知周期T =" 0.02" s,所以u = V。原本L2正常发光,只断开S2后,电压被两灯泡均分,肯定不会再正常发光。只断开S2后,两灯泡串联,负载电阻增大,输出功率减小,输入功率等于输出功率,所以也减小...