发布时间:2025-01-30 14:06:31
得力订书机按反订卡订取出来重新装。
取出订书机和一条订书钉,订书机共三层,右手拇指和食指拿住中间层,装订书钉那层,其他手指按住底层,左手拉开第一层,拉到底,注意右手一定要按好下面两层哦,不然中间层可能会弹起伤到手,按方向放置订书钉,然后将第一层慢慢拉起放回原位,就可以了。
求40cr圆钢及45圆钢下料重量计算公式例如长1640mm直径85下料重量多少告诉详细公式
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