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周期系
chem. periodic classification
met. periodic system
tech. cyclic system (统); cyclical system (统); periodic system (统); periodical system (统)
周期系: 52 phrases in 24 subjects
Agriculture2
Automobiles1
Aviation4
Bridge construction1
Business1
Corporate governance1
Cryptography1
Economy1
Electric machinery1
Electronics1
Explosives and Explosive Ordnance Disposal1
Finances1
Information technology7
International trade1
Marketing1
Mathematics1
Multimedia1
Name of organization1
Oil / petroleum1
Planning1
Space3
Statistics1
Technology17
Wind Energy1

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