NPT、PT、G、RC螺纹的区别
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ISO 1127-1992
EN10305_Cold_drawn_precision_steel_tubs
EN10270-1
EN-10217-7-en
DIN 2462.2-1981 德国不锈钢管标准
DIN 2353-1998
1092-1
沪ICP备12009044号-1