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标准螺纹
tech. normal screw; standard screw; unified thread
标准 螺纹: 145 phrases in 18 subjects
Architecture1
Automobiles9
Aviation16
Drilling10
Earth sciences5
Economy1
General20
Hydrology1
Mechanic engineering5
Mechanics22
Metallurgy2
Oil / petroleum8
Plastics3
Rail transport2
Shipbuilding1
Space2
Technology36
Wind Energy1