三元乙丙可以安装由镇、机械紧固或完全遵守。
EPDM can be installed by either ballasting, mechanical fastening or full adherence.
螺栓：通常与螺母一起用于连接两个或更多零件的机械紧固件。
Bolt: Mechanical fastener, usually used with a nut, for connecting two or more parts.
矫直工在交接班时先检查机械紧固件和液压传动系统，操作手柄及按钮能否正常。
The straightening machine checks the mechanical fasteners and the hydraulic transmission system during the shift, the operation handle and button can be normal.
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