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zhangxiaosan

zhangxiaosan a publié:

zhangxiaosan
Road design for the artificial structures Village road with space, power stations, parking stations, gas stations, shops, dam gates and other building structure along the combination, especially in combination with the design of urban roads lined with groups of buildings and space, building ...

qzz10011

qzz10011 a publié:

qzz10011
Physical properties of metal materials Physical properties of the metal main considerations: ⑴ density (specific gravity): ρ = P / V units of g / cc or t / m, where P is the weight, V is the volume. In practice, in addition to calculate the weight of the metal parts according to density, but it ...