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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
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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 itB
first-aid techniques for treating electrical shockC
cardiopulmonary resuscitation (CPR)D
All of the above
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