题目内容

吸收利用不同来分离气体混合物。

A. 溶解度
B. 沸点
C. 挥发度
D. 凝固点

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选择吸收剂的主要原则是（）。

A. 溶解度：吸收剂对溶质组分的溶解度要大
B. 选择性：吸收剂应对溶质组分有较大溶解度，而对混合气体中其他组分溶解度甚微
C. 黏度：吸收剂在操作温度下的黏度要低
D. 挥发度：吸收剂的蒸汽压要低，即挥发度要小

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Part II Listening Comprehension（25 minutes）Section ADirections: In this section, you will hear three news reports. At the end of each news report, you will hear two or three questions. Both the news report and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A), B), C) and D). Then mark the corresponding letter on Answer Sheet 1 with a single line through the centre.Questions 1 and 2 will be based on the following news item.[音频]

A. He has decided to retreat from the talks.
B. He has supported the talks.
C. He has covered doubts about the talks.
D. He has opposed the talks.

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Questions 1 and 2 will be based on the following news item.

A. The spread of nuclear weapons in the Middle East.
B. The position taken by the Security Council .
C. The pollution of nuclear plants .
D. The tougher position of Iran on the nuclear issue .

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Questions 3 and 4 are based on the news report you have just heard.[音频]

A. 25
B. 10
C. 35
D. 15

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吸收利用不同来分离气体混合物。

A. 溶解度 B. 沸点 C. 挥发度 D. 凝固点

选择吸收剂的主要原则是（ ）。

Questions 1 and 2 will be based on the following news item.

Questions 3 and 4 are based on the news report you have just heard.[音频]

A. 溶解度
B. 沸点
C. 挥发度
D. 凝固点

选择吸收剂的主要原则是（）。