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答出安装压力表测压点时应注意哪些问题？

答案

参考答案：

1、压力表取压点必须选在能正确反映被测压力实际值的地点.。

2、压力表与被测介质的取压点，不能在同一水平位置时，应考虑静压对压力指示的影响。

3、安装位置应力求避开振动和高温。

4、测量蒸汽压力，应加装凝液管，以防高温气体与测量元件直接接触.对有腐蚀性的介质，应加装中性介质隔离液。

5、取压器到压力计之间应有切断阀。

6、需要进行现场校验和经常冲洗的引压管，应将切断阀该装成三通阀。

阅读理解

Marco Polo(马可波罗) was born in Venice in 1254. He was the most famous foreigner to visit Asia（亚洲）during the Middle Ages. He wrote a book about his travels. In his book he wrote all the things he saw and heard. Many people in the west read the book, but few believed what Marco Polo said in the book. He told stories about a lot of strange people and places. But at that time nobody knew these places and the people.

When Marco Polo was still very young, he decided to travel together with his father. It took them more than three years to travel to China, later he became a friend of the Chinese emperor (皇帝) . He learned to speak Chinese when he traveled around, and he talked to many people in Chinese. The emperor liked him and made him a Chinese Official(官员). At that time Marco Polo was only thirty years old. After nearly seventeen years’ travel in the east, Marco and his father wanted to go back home.

When Marco and his father arrived in Venice many years later, their family and friends saw them again. They couldn’t believe their eyes because Marco and his farther were quite old. Marco Polo and his father had been away for almost 25 years.

小题1:Marco Polo was                             foreigner           the Middle Ages.

小题2:Marco Polo wrote a famous book ___________ “The Travels of Marco Polo”. He wrote __________           _ he saw and heard in the book.

小题3:Many people in the west read the book, but ____  _____ believed ________    ____.

小题4:It took Marco Polo and                  over three years to ________  __________.

小题5:Marco Polo and his father had been away ____                            .

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