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钢系
el. actinide series; actinium family; actinium series
钢系: 193 phrases in 22 subjects
Advertising1
Architecture2
Automobiles2
Aviation4
Bridge construction4
Communications2
Consulting2
Drilling4
Earth sciences1
Ecology1
Electronics4
General7
Hydroelectric power stations1
Mechanics1
Metallurgy74
Nautical1
Navigation2
Oil / petroleum1
Oil and gas technology1
Rail transport4
Shipbuilding2
Technology72