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问题 问答题 简答题

请说明静噪电路的作用？

答案

参考答案：

在不通话时或者通话等待间歇时，自动锁闭接收机的低频放大电路，使噪声不致从扬声器输出，以免对电台使用人员造成干扰。而在接收呼叫或者通话时能自动解除锁闭，使接收机正常工作。

补全对话，情景问答
选择正确的句子补全对话。
A. We have a new classroom.
B. Where's my seat?
C. Good afternoon.
D. Let's go and have a look.
E. This is John, our new classmate.
Mike: Good afternoon, Chen Jie.
Chen: 1____________, Mike.
Mike: Chen Jie. 2____________
Chen: Nice to meet you.
John: Nice to meet you, too.
Chen: Mike. 3____________
Mike: Really? 4____________
John: Wow! It's so big! 5____________
Mike: It's near the window.
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单项选择题

The history of African—Americans during the past 400 years is traditionally narrated (1) an ongoing struggle against (2) and indifference on the part of the American mainstream, and a struggle (3) as an upward movement is (4) toward ever more justice and opportunity.

Technology in and of (5) is not at fault; it’s much too simple to say that gunpowder or agricultural machinery or fiber optics (6) been the enemy of an (7) group of people. A certain machine is put (8) work in a certain way—the purpose (9) which it was designed. The people who design the machines are not intent on unleashing chaos; they are usually trying to (10) a task more quickly, cleanly, or cheaply, (11) the imperative of innovation and efficiency that has ruled Western civilization (12) the Renaissance.

Mastery of technology is second only (13) money as the true measure of accomplishment in this country, and it is very likely that by (14) this under-representation in the technological realm, and by not questioning and examining the folkways that have (15) it, blacks are allowing. (16) to be kept out of the mainstream once again. This time, however, they will be (17) from the greatest cash engine of the twenty-first century. Inner-city blacks in particular are in danger, and the beautiful suburbs (18) ring the decay of Hartford, shed the past and learn to exist without contemplating or encountering the tragedy of the inner city.

And blacks must change as well. The ways that (19) their ancestors through captivity and coming to freedom have begun to loose their utility. If blacks (20) to survive as full participants in this society, they have to understand what works now.

15（）

A. encountered

B. encountering

C. to encounter

D. encounters
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