两个大螺栓是用来插入到另半个ramp，起固定作用的。

来源: dvdport 于 2017-12-08 10:02:08 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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两个大螺栓是用来插入到另半个ramp， 起固定作用的。