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qzz10011

qzz10011 publicou:

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 ...

meishengchao

meishengchao publicou:

meishengchao
Note Six: cork flooring observe whether the straight side, take the same floor 4, laying on the glass or on relatively flat ground, after assembled together to see whether the commissure. Generally speaking, the floor is to pack sale and installation of cork flooring sales companies will pay ...