回复Ins_032172ee发表于:2020/7/31 20:03:34悬赏金额:
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关于美标产品伸长率标距的标定:此产品标准中规定了标距为50mm,这是在直径为12.5mm的情况下,如果试棒直径不为12.5mm,那么这里的标距50mm,是不是也应该相应的发生变化啊?我查询了一下相关美标,这里的标距直径比为4:1。[img=,690,283]https://ng1.17img.cn/bbsfiles/images/2019/07/201907311946573042_9439_3502509_3.png!w690x283.jpg[/img][img=,690,364]https://ng1.17img.cn/bbsfiles/images/2019/07/201907312003150252_3773_3502509_3.png!w690x364.jpg[/img][img=,690,552]https://ng1.17img.cn/bbsfiles/images/2019/07/201907312003164602_9274_3502509_3.png!w690x552.jpg[/img]