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保护开关 bǎohù kāiguān
hydroel.st. protection switch
space protective switch
保护开关: 38 phrases in 15 subjects
Agriculture1
Automobiles1
Aviation4
China1
Construction1
Electric machinery2
Electronics5
Hydroelectric power stations2
Information technology2
Metallurgy1
Nuclear and fusion power1
Plastics1
Rail transport1
Technology12
United Nations3