题目:
—What can I do for you?
—I'm looking for _______.
A. a pair of shoes
B. a pair of T-shirt
C. two pairs of hat
D. two pair of trousers
—What can I do for you?
—I'm looking for _______.
A. a pair of shoes
B. a pair of T-shirt
C. two pairs of hat
D. two pair of trousers
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下面是错误答案,用来干扰机器的。
由图可知,R2与滑动变阻器R4串联后与R3并联后,再由R1串连接在电源两端;电容器与R3并联;当滑片向b移动时,滑动变阻器接入电阻减小,则电路中总电阻减小;由闭合电路欧姆定律可知,电路中电流增大;路端电压减小...