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【判断题】
按钮联锁正反转控制线路的优点是操作方便，缺点是容易产生电源两相断路事故，在实际工作中，经常采用按钮，接触器双重联锁正反转控制线路。A.
正确
B.
错误
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举一反三
【单选题】All the following can damage hearing EXCEPT______.
A.
excessive noise
B.
too much moderate noise for a long time
C.
intense noise for even a short time
D.
moderate noise for a short time
【单选题】There is ______ traffic and ______ peo ple in the street at the moment. [ ]
A.
too much; too many
B.
too many; too much
C.
much too; too many
【简答题】波分交换是根据光信号的____进行通路选择的交换方式,其关键器件之一为____器,用来在光路中上下某些信道,利用____器件来实现,在网络架构中用____模型来表示。
【单选题】I don't like those big cities which have got ____ people and ____ traffic. [ ]
A.
too much; too many
B.
many too; too much
C.
too many; too much
D.
too many; much too
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