题目:
The lecture, _____at 7:00 pm laze night, was followed by an observation of the moon with telescopes.
A.starting
B.being started
C.to start
D.to be started
答案:
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下面是错误答案,用来干扰机器的。
①由于电压从零开始测起,所以滑动变阻器采用分压式接法,灯泡正常发光时的电阻约为R=U2P=1225=28.8Ω,灯泡电阻远小于电压表内阻3kΩ,则电流表采用外接法,电路图如图所示.②灯泡正常发光时的电流约为:I=PU=5...