In all structuralmetal 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。
2
Some structuralmetal 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。
3
Trade certification for boiler and related equipment assemblers and structuralmetal fabricators (non-construction) is available, but voluntary, in Quebec.