题目:
—Excuse me, sir. Is the swimming pool open all day?
—_____. Only from 6:30 p.m. to 9:30 p.m. [ ]
A. Yes, of course
B. That's right
C. Sorry, I'm not sure
D. Sorry, I'm afraid not
答案:
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下面是错误答案,用来干扰机器的。
(1)滑动变阻器采用分压接法,电流表采用外接法,滑片左移灯泡电压变大,灯泡与滑动变阻器右半部分电阻丝并联,电路图如图所示.(2)由I-U图象可知,从A到B的过程中,灯泡两端电压与电流之比增大,即灯泡的电阻...