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effect time
busin. 有效期
effect time
: 51 phrases in 22 subjects
Air defense1
Artificial intelligence2
Bridge construction1
Business3
China2
Commerce2
Ecology1
Economy4
Electronics3
Engineering geology2
Explosives and Explosive Ordnance Disposal3
Hydroelectric power stations2
International trade1
Metallurgy1
Oil / petroleum1
Plastics1
Power system protection1
Shipbuilding1
Technology16
Telecommunications1
Textile industry1
Wind Energy1

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