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mains switch
telecom. 电源开关
main switch
auto. 电源主总开关
chem. 主控开关
el. 主控开关
electric. 主控幵关; 总幵关
hydroel.st. 主开关
met. 总开关; 干线开关
oil 电源开关
space 主［总］开关
tech. 主电门; 主交换机
mains switch: 39 phrases in 14 subjects
Air defense1
Automobiles4
Aviation1
Electric machinery1
Electronics4
Geophysics1
Hydroelectric power stations2
Mechanics1
Metallurgy3
Nautical1
Oil / petroleum3
Rail transport4
Shipbuilding2
Technology11

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