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dingzi
- 通过钉子的长度和宽度,对不同的钉子进行比较,当与标准尺寸不同时,定为不合格钉子。检验钉子是否合格-Through the length and width of nails, carries on the comparison to different nails, when not at the same time with the standard size, as unqualified nails. Test whether qualified nail