Of all metal construction are wing structures of modern high-speed airplanes.
现代 高速 飞机的机翼全是金属结构的.
A study of the copper hollow cathode laser with all metal construction
全金属结构铜空心阴极激光器的研究
Magnesium and magnesium alloys are the most light in all of the metal construction materials, its density only contain 1.74/ cm~ 3, is an aluminum of 2/ 3, lighter than steel 78.1%.
镁及镁合金是所有金属结构材料中最轻的,其密度只有1.74/cm~3,是铝的2/3,比钢轻78.1%。
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