表面热处理：是增加强紧固件的硬度或任何表面积上的机械性能。
Surface heat treatment: surface heat treatment is a process that improves the hard-ness or other mechanical property of the fastener in any surface area.
表面热处理：是增加强紧固件的硬度或任何表面积上的机械性能。
Surface heat treatment: surface heat treatment is a process that improves the hard-ness or other mechanical property of the fastener in any surface area.
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