如图所示电路中，电源电压u=31lsinl00πt（V），A、B间接有“220V_爱下问搜题

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问题多选题

如图所示电路中，电源电压u=31lsinl00πt（V），A、B间接有“220V 440W”的电暖宝、“220V 220W”的抽油烟机、交流电压表及保险丝．下列说法正确的是（）

A．交流电压表的示数为311V

B．电路要正常工作，保险丝的额定电流不能小于3A

C．电暖宝发热功率是抽油烟机发热功率的2倍

D．1min抽油烟机消耗的电能为l．32×10⁴J

答案

BD

完形填空

“Mum, I want to make you a bet,” I said. “If I go a whole year without TV, will you give me a hundred dollars?”　　
“Well, if you can   1  do it, …”
“Of course I can,” I replied, trying to convince   2 .
In fact, all this started from my   3  of a picture in the newspaper. I couldn’t bear to look at that boy. He said that he had   4  one year without TV for a hundred dollars,   5 me with mocking eyes. It seemed he was saying, “I did it,   6  you can’t!”. I glared at the boy’s face.
That year I did a lot of things. For example, my father taught me to   7 , which became my favorite sport.   8  winter afternoons snowball wars with my neighbors offered daily drama. I went on bike trips with my friends and swam as much as a fish.　　
It was unbelievable how much   9  I had without TV. I learned so many new games. I guess the   10  thing I learnt, though, was self-motivation(上进心).　　
I started to do my homework. I went from a D student to an A student within a couple of   11 .　　
I used to   12  reading if there were no   13 , but now I began to read and enjoy it. I could arrange off all the pictures just the way I wanted them—my own little TV, right   14  my head!
I’m surprised what I did. I got a lot more from the   15  than just the 100 dollars!

B．laughing at

C．talking with

D．looking after

判断题

25码是一种类似于39码的条码，它的密度较高，能够替代39码。（）