题目内容

在照明电路中，电路的供电端N和L分别表示（）、（）。

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照明电路中，（）进开关,保险丝选择额定电流的（）倍（在区间内）。

Put one word in each space to complete this extract from a presentation.Thanks everyone (0) for coming. Today 'd like to (1) ___ you a bit about our new company. I'll be (2)_ so if you have any questions please wait and I'll be (3)_ to answer them at the end.First of (4) _ how did we get the idea for Mobile Media? I met Steve my partner three months ago when he was working with Vodafone to ...One other thing I'd like to point (5) is that this is not a technology just for the future. It is already being used in China and Korea.... Finally, I'd just like to (6) you this chart which (7) an overview of all the possibilities that this technology offers. We are really excited about the prospects for it and I hope I've been able to communicate some of that enthusiasm to you today.Thanks for (8)__. Are there any questions?

有功功率只有（）元件消耗；无功功率只有（）和（）元件消耗。

某电路中，当复阻抗的虚伪为0的时候，发生谐振。

A. 对
B. 错