In all structural metal and alloy material, the density of the magnesium is the lowest.
在所有结构用金属及合金材料中，镁的密度最低。
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。
Trade certification for boiler and related equipment assemblers and structural metal fabricators (non-construction) is available, but voluntary, in Quebec.
锅炉工及相关设备的装配工和金属结构制造者的行业认证(非建造业)是可用的，而在魁北克省是自愿考取。
Trade certification for boiler and related equipment assemblers and structural metal fabricators (non-construction) is available, but voluntary, in Quebec.
锅炉工及相关设备的装配工和金属结构制造者的行业认证(非建造业)是可用的，而在魁北克省是自愿考取。
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