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问题 多项选择题

常用的共模抑制方法有（）.

A.利用变压器或光电耦合器把各种模拟负载与数字信息源隔离开来

B.采用浮地输入双层屏蔽放大器来抑制共模干扰

C.利用双端输入的运算放大器作为模拟转换器的前置放大器

D.用仪表放大器来提高共模抑制比

答案

参考答案：A, B, C, D

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) .

60().

A.circumstance 

B.environment 

C.surroundings 

D.space
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单项选择题

关于径向反应器催化剂装填前的准备工作，下列叙述错误的是（）。

A、反应器内构件全部安装完毕

B、出口收集器等部件已经安装固定完好

C、卸料管的出口盲板安装完毕

D、催化剂装填人员现场就位
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