nbkxhwd@163.com 发表于 2020-7-2 11:27:21

BS 1560-3.3 1989 Circular flanges for pipes valves and fittings Steel cast iron

BS 1560-3.3 1989 Circular flanges for pipes valves and fittings Steel cast iron and copper alloy flanges

admin 发表于 2020-7-6 12:02:01

谢谢您的分享,金币已奖励!
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