金属石墨电刷

diffusion on paste diffusions except Si into metal surfaces

metal straddling dowel

TAPPING metal or other material [= screw-threading]

technology of light metal【材】

metal complex azo dyes

flattening test of metal【材】

spark discharge generation of shock waves, metal shaping B 21 D 26/12 运输

babbitt metal bearing【机】