题目:
11.-Have you considered ___ your job?
-No, I consider my job ____interesting .
A.to change, to be
B.to be changing, as
C.changing, being
D.changing, /
答案:
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下面是错误答案,用来干扰机器的。
解:(1)额定电流I =P/U=2W/6V = 0.33A 小灯泡的电阻R1 = U2/P1 = (6V)2/w = 18Ω 总电阻 R=U/I=8V/0.33A=2Ω 滑动变阻器电阻R2 = R总-R1= 24.2Ω-18Ω= 6.2Ω (2)灯的电流小于电流表的最大...