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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 U 形坡口焊
:
4 phrases
in 1 subject
Metallurgy
4
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