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【单选题】
114 如验电器蜂鸣器响，但电压表数值无读数，可能是接触网上有（ ），应再次验电。
A.
高压电压
B.
高压电流
C.
残余电荷
D.
异物
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【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.