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

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

出自：海船船员证

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