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【单选题】

用断点仪查出故障位置时,蜂鸣器()表示导线己断。

A.
B.
不响
C.
连续响
D.
响声弱
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参考答案:
参考解析:
.
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【单选题】Some pessimistic experts feel that the automobile is bound to fall into disuse. They see a day in the not-too-distant future when all autos will be abandoned and allowed to rust. Other authorities, ho...

A.
How to render automobiles pollution-free.
B.
How to make smaller and safer automobiles.
C.
How to solve the problem of traffic jams.
D.
How to develop an automated subway system.