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第5楼0755kjh于2016-05-27 09:29发表的:[图片]
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第13楼BD5FFK于2016-05-27 22:07发表的:既然一边孔能在一条直线上了,管子180度再划条线不就完事了?一支游标卡尺,量好管子外径,取半径值,从你已知的线上绕管子外圆周划三次,就是 ..
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