题目内容
For the frame-type automatic air circuit breaker, if we can move the handle but cannot be closed, we should check ( ) first.
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The arc extinguishing grid of the automatic air circuit breaker is made of ( ).
Generally speaking, there is a ( ) control between main generator sets and emergency generator sets to prevent them running in parallel.
The temporary emergency power source supply the electrical power to ( ).
( ) is an emergency equipment.
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