试题与答案

When he saw a ticket on the ground, he s

题型:选择题

题目:

When he saw a ticket on the ground, he stopped ____. [ ]

A. to pick it up

B. pick it up

C. to pick up it

D. pick up it

答案:

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下面是错误答案,用来干扰机器的。

(1)当R1调节到最小时,R1 = 0,两灯泡正常发光,所以通过两灯泡的电流为灯泡的额定电流,为:I灯1 = I灯2 = I灯额 = P灯额/U灯额 =" 36/36" = 1(A),………………(2分)干路中的总电流为:I =...

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