传奇3

　　输送带是工业生产上不可缺少的一种设备，但是在使用的过程中难免会出现各种不可抗力的因素使输送带变长，进而影响输送带的使用寿命，那变长的输送带能不能自主的复原呢?

SHUSONGDAI

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