电梯门平时锁紧,但是当电梯到达这一层则打开,这种是需要什么装置来达到要求的? 知乎 Template




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tomski电梯门平时锁紧,但是当电梯到达这一层则打开,这种是需要什么装置来达到要求的? 知乎 coloring