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周期循
hydroel.st. period
周期循
: 54 phrases in 23 subjects
Agriculture1
Air defense1
Aviation2
Bridge construction1
Business1
Commerce5
Compressors1
Drilling1
Ecology1
Economy2
Electronics4
Finances2
International trade1
Mathematics1
Mechanics1
Metallurgy2
Nautical1
Oil / petroleum2
Quality control and standards1
Space2
Statistics4
Technology14
Textile industry3