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问题 单项选择题

溴化锂制冷装置起动程序，首先起动的是冷却水和冷冻水系统，当压力与流量正常后，再起动发生器泵和吸收泵运行，然后打开（）阀门，进行制冷量自动调节。

A.蒸气调节阀

B.旁通阀

C.三通阀

D.屏蔽泵

答案

参考答案：A

单项选择题

Although interior design has existed since the beginning of architecture, its development into a specialized field is really quite recent. Interior designers have become important partly because of the many functions that might be (51) in a single large building.

The importance of interior design becomes (52) when we realize how much time we (53) surrounded by four walls. Whenever we need to be indoors, we want our surroundings to be (54) attractive and comfortable as possible. We also expect (55) place to be appropriate to its use. You would be (56) if the inside of your bedroom were suddenly changed to look (57) the inside of a restaurant. And you wouldn’t feel (58) in a business office that has the appearance of a school.

It soon becomes clear that the interior designer’s most important basic (59) is the function of the particular (60) .

52().

A.obscure 

B.attractive 

C.appropriate 

D.evident
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单项选择题

设关系R与S具有相同的目，且对应的属性的取值来自同一个域，则t\t∈R∧t∈ S，t是元组的变量，其结果关系是( )。
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