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凝结水铜管选材的依据是什么？

答案

参考答案：

凝汽器管材选择的依据主要有以下三点：即①冷却水含盐量；②冷却水在铜管内的流速；③针对最有可能产生某种腐蚀的主要因素重点考虑。目前电力系统凝汽器铜管选材见表30：

选择题

下列词语中加线的字，每对读音都不相同的一组是（   ）

A．菡萏/谄媚秕谷/毗邻万籁俱寂/水獭行伍/引吭高歌

B．傧相/河浜豢养/浣洗皴裂/疏浚青稞茶/裸视

C．绮丽/旖旎涪江/蓓蕾觥筹交错/口供拊掌大笑/物阜民丰

D．薄荷/薄饼佝偻/勾当宵衣旰食/肖像诲人不倦/恚恨
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单项选择题

At the time friends visit us in the evening, they often tell us they are in a hurry and look at their watches. It isn’t that our friends are all very busy; it is just that we haven’t got a television. People think that we are very strange. "But what do you do in the evening", they are always asking. The answer is very simple. Both my wife and I have hobbies. We certainly don’t spend our evenings looking at the walls. My wife enjoys cooking and painting and often attends evening classes in foreign languages. This is quite useful as we often go abroad for our holidays. I collect stamps and I’m always busy with my collection. Both of us enjoy listening to the music and playing chess together.

Sometimes there are power cuts and we have no electricity in the house. This does not worry us and we just light candles and carry on with what we were doing before. Our friends, however, are lost—no television! —So they don’t know what to do. On such evenings our house is very full for they all come to us. They all have a good time. Instead of sitting in silence in front of the television, everybody talks and plays games.

At night when there is no electricity, the couple ().

A．have to look at the walls

B．can do nothing but sit in silence

C．will have many visitors

D．have to go out for candles
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