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main system
IT 主系统
tech. 配水管系统
main system
: 101 phrase in 22 subjects
Architecture2
Automobiles1
Aviation8
Earth sciences3
Ecology1
Electric machinery1
Electronics9
General1
Hydraulics2
Hydroelectric power stations1
Mathematics1
Metallurgy3
Nautical2
Nuclear and fusion power8
Project management1
Rail transport2
Refrigeration2
Shipbuilding7
Space2
Technology42
Telecommunications1
Wind Energy1

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