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双面 J 形坡口焊
met. double-J groove weld; open-double-J butt weld
双面 V 形坡口焊
met. open-double-V groove weld
双面 U 形坡口焊
met. open-double-U groove weld
双面 J 形坡口焊
: 4 phrases in 1 subject
Metallurgy4

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