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J420
J420
J420
例句：
1
The
poor
corrosion
resistance
of
the
welding
seam
was
determined
by
its
microstructure
after
the Q235
steel
was jointed
by
J420
electrode
.
研究
结果
表明
Q235
钢
用
J420
焊条
焊接
后
，
焊缝
的
组织
特点
决定
了
其
耐
蚀
性
较差
。
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形吊灯
拓扑
man
,
.
Facebook
you
's
after
"
a
then
not
what
say
by
?
of
as
J420J420