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针齿轮螺旋量
coal. face advance
螺旋量: 44 phrases in 15 subjects
Animal husbandry2
Automobiles2
Aviation1
Dermatology2
Drilling1
Electric machinery1
Electronics1
Explosives and Explosive Ordnance Disposal1
General1
Metallurgy3
Oil / petroleum2
Shipbuilding4
Skydiving1
Space1
Technology21