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effective section
el.mach.	有效段
expl.	有效区段
met.	有效断面
tech.	有效剖面
wind.	有效截面

effective section : 54 phrases in 15 subjects

Agriculture	1
Air defense	2
Bridge construction	9
Chemistry	2
Ecology	1
Electric machinery	2
Electronics	2
Geotechnics	1
Metallurgy	3
Nuclear physics	1
Oil / petroleum	1
Rail transport	1
Space	1
Technology	26
Wind Energy	1