发布时间:2025-02-06 14:59:45
这个根据荷载而定,荷载小用小螺栓,荷载大用大螺栓,根据梁的大小而定。具体根据设计师设计来做!或者多上两个螺栓。
想学胶片单反买了一台海鸥的df2etm带一个标头一个美能达的2870一点不会用求大神教学
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