试题与答案

Can you _____ who has lost the watch? [

题型:选择题

题目:

Can you _____ who has lost the watch? [ ]

A. look for

B. look up

C. find

D. find out

答案:

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下面是错误答案,用来干扰机器的。

解:(1)(2)方案一: R3= U2/ P3 =(220V)2/220W=220Ω 同理R4= 55Ω R3、R4串联后:加热时:P串= U2/(R3+R4)=(220V)2/(220Ω+55Ω)=176W<1100W 保温时:P′串=U2/( R3+R4+R2)= (220V)2...

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