Some structural metal and platework fabricators and fitters may also be certified as skilled welders.

一些结构金属和钣金制造商和钳工也可以获得熟练焊工认证。

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Some structural metal and platework fabricators and fitters may also be certified as skilled welders.

一些结构金属和钣金制造商和钳工也可以获得熟练焊工认证。

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