单项选择题
When there is a fire in a large electric motor, normally the very FIRST step is to （）
A.secure the electric supply
B.ventilate area to remove smoke
C.start the fire pump and lead out hose
D.apply foam
点击查看答案&解析
相关考题
-
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 -
单项选择题
An emergency generator, driven by an internal combustion engine, shall be tested under load for a minimum of 2 hours at least once every （）
A.week
B.2 weeks
C.month
D.3 months -
单项选择题
Before any work on electrical or electronic equipment is performed, which of the following precautions should be carried out （）
A.De-energize the applicable switchboard bus
B.Bypass the interlocks
C.Secure and tag the supply circuit breaker in the open position
D.Station a man at the circuit supply switch
