水冷式冷凝器的除垢方法有()

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问题:

水冷式冷凝器的除垢方法有()

考点:暖通空调暖通空调题库
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阅读短文,完成下面的表格。
  Welcome to China. After you go to Beijing and Shanghai, you could see the
differences between them. In some ways they look the same, in some ways they
look different. Both of them have tall buildings and wide streets, although some
buildings in Shanghai are much taller than those in Beijing. They are both
important in China. Beijing is the capital of China, but Shanghai is the biggest
city in China. And there are more famous places of interest in Beijing than those
in Shanghai. You can go to the Great Wall, the Palace Museum and so on.
  Now they are becoming more and more important in China. And they are
famous all over the world.
Information Card
What do the two places both have?1. They have _____.
What are some buildings in Shanghai
different from those in Beijing?
2. The buildings in Shanghai are
_____ those in Beijing.
Which city is the capital of China?3. _____.
which city is the biggest one in China?4. _____.
Are there a lot of places of interest in Beijing?5. _____.
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下列物态变化现象中,属于液化的是[ ]

A.夏天,剥去冰棒的包装纸,看到“白气”

B.洒在教室地上的水变干

C.放入冰箱冷室的矿泉水结成了冰

D.冬天,室外冰冻的衣服干了

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东风8e型内燃机车空调系统电气控制部分包括电气控制箱和电气操纵盒,其中控制系统的控制电源是()。

A、来自机车蓄电池的110V直流电源

B、来自空调电源的三相交流电源

C、机车辅助发电机

D、其他

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捣固是将钢轨底部轨枕下的道砟捣压密实。

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用湿型铸造时,常发生夹砂结疤,鼠尾和沟槽,分析其产生的原因及防止措施?

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