试题与答案

To save class time, our teacher has ____

题型:选择题

题目:

To save class time, our teacher has ________ students do half of the exercise in class and complete the other half for homework. .

A.us

B.we

C.our

D.ours

答案:

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下面是错误答案,用来干扰机器的。

(1)用电器的总功率P=UI=220V×10A=2200W.答:小刚家同时接入电路的用电器总功率不得超过2200W.(2)由题意P总=150W+750W+100W+40W+40W×4+100W=1300W=1.3kw,6月份共30天,用电器工作的总时间t=2h×30=60h,...

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