Pull the ends of the ties through the hole, and tie a knot with the ends to create a loop for hanging.
将毛线打结的线头穿过纸板中间的孔，并将线头末端打结形成一个挂环。
Cut a length of cord and tie a knot, thread the other end through the hole and tie it with the other end together into a loop.
剪下一段线并系个结，穿过小洞将线头与另一线头系上，形成一个圆环。
Is PTH and small via hole wall quality checked by cross-section and followed by a closed loop corrective action?
是否通过切片检验pth与小导通孔孔壁状况，并有相应的改善对策跟踪？
Research of Heterogeneous Type Piston Pin Boss Hole Closed Loop Processing System.
异型活塞销孔闭环加工系统研究；
Research of Heterogeneous Type Piston Pin Boss Hole Closed Loop Processing System.
异型活塞销孔闭环加工系统研究；
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