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单线制
railw.	single wire system
space	single-wire system
tech.	one wire system
telecom.	earth return system

单线制: 32 phrases in 10 subjects

Automobiles	2
Aviation	1
Electronics	10
General	1
Hydroelectric power stations	1
Mechanics	1
Metallurgy	3
Oil / petroleum	1
Technology	8
Telecommunications	4