wzg8762 发表于 2020-12-1 08:57:50

ASTM A27/A27M-20 Steel Castings, Carbon, for General Application

ASTM A27/A27M-20 Standard Specification for Steel Castings, Carbon, for General Application
一般用途碳素钢铸件标准规范

admin 发表于 2020-12-1 09:48:28

谢谢您的分享,金币已奖励!
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