单项选择题
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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Before any work on electrical or electronic equipment is performed, which of the following precautions should be carried out （）
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单项选择题
Which of the following statements represents the FIRST precaution to be taken prior to working on any installed electrical component （）
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