针对煤矿井下局部通风机风电闭锁装置受距离影响的问题，提出三种设计思路。
In view of the problem that the interlocked circuit-breaker of underground local fan is influenced by the distance, the paper puts forward three kinds of design thought.
针对煤矿井下局部通风机风电闭锁装置受距离影响的问题，提出三种设计思路。
In view of the problem that the interlocked circuit-breaker of underground local fan is influenced by the distance, the paper puts forward three kinds of design thought.
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