单项选择题
If a steering motor becomes overloaded, the （）
A.overload condition of 5 % will trip the motor off the line immediately
B.overload condition will be indicated visually in the machinery space
C.motor running indicator will begin to flash "on" and "off" in response to the sustained overload condition
D.standby steering pump will start automatically and come on the line
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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 -
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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
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A.week
B.2 weeks
C.month
D.3 months
