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baseb. 双重替换
tech. 两路开关; 双叉轨
double switch: 70 phrases in 19 subjects
Architecture1
Automobiles1
Business1
Communications1
Computer numerical control1
Electricity2
Electronics8
General3
Geophysics4
Hydroelectric power stations1
Metallurgy5
Navigation1
Nuclear and fusion power1
Oil / petroleum1
Rail transport2
Shipbuilding1
Space6
Technology29
Telecommunications1