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单元组
telecom. sigma; unique tuple
单元 组: 162 phrases in 28 subjects
Architecture1
Astronautics1
Automobiles1
Aviation10
Bridge construction1
Business2
Chemistry5
Electric machinery5
Electronics42
Engineering geology1
Exhibitions1
General5
Geophysics1
Hydroelectric power stations1
Information technology8
Life sciences1
Metallurgy1
Oil / petroleum5
Polymers3
Project management1
Rail transport5
Refrigeration4
Shipbuilding2
Space14
Steel production1
Technology36
Telecommunications2
Textile industry2