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百炼成钢
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无聊地过着没有意义的日子 偶尔期待一点意思
2020/01/22注册，6 小时前活动
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具备弹性的塑料结构 螺纹还可以“贴合” 但是金属件是不能靠螺纹“贴合”的必定需要和设计一个可以利用弹性接触的密封结构 螺纹紧紧提供“锁紧”产生的压力当然也可以靠生料带 甚至大型管道也继续有类似的各种带