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问题:

[单选题]When working on a high voltage circuit, you should always have another person present with you.This person should have a good working knowledge of ()

A、the circuit being worked on and the location of all switches and circuit breakers controlling it
B、first-aid techniques for treating electrical shock
C、cardiopulmonary resuscitation (CPR)
D、All of the above

参考答案: D

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