When the personnel pass in and out, can pass the small door, the convenience is fast, reducing the door to open the number of times at the same time, extension service life.
人员进出时，可通过小门，方便快捷，同时减少门的开启次数，延长使用寿命。
When the personnel pass in and out, can pass the small door, the convenience is fast, reducing the door to open the number of times at the same time, extension service life.
人员进出时，可通过小门，方便快捷，同时减少门的开启次数，延长使用寿命。
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