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周期循
hydroel.st.
period
周期循
:
54 phrases
in 23 subjects
Agriculture
1
Air defense
1
Aviation
2
Bridge construction
1
Business
1
Commerce
5
Compressors
1
Drilling
1
Ecology
1
Economy
2
Electronics
4
Finances
2
International trade
1
Mathematics
1
Mechanics
1
Metallurgy
2
Nautical
1
Oil / petroleum
2
Quality control and standards
1
Space
2
Statistics
4
Technology
14
Textile industry
3
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