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考研
The writer holds that_______. Active noise-cancellation systems require______.
The writer holds that_______. Active noise-cancellation systems require______.
admin
2010-09-06
79
问题
The writer holds that_______.
Active noise-cancellation systems require______.
选项
A、microphones
B、microprocessors
C、loudspeakers
D、all of the above
答案
D
解析
细节题。题意为:"主动消除噪声系统需要______"。请参考文章最后一段倒数第二句:这一系统作为一种消音器最有效;其中麦克风、微处理器和扬声器三者组成一个单元围住发声的设备,在声源处消声。由此可知其他三个选项都是需要的,故答案选项正确。
转载请注明原文地址:https://kaotiyun.com/show/e2Z4777K
0
考研英语一
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