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正丁 zhèngdíng
tech. n-butyl ether
正丁: 164 phrases in 21 subjects
Aviation1
Chemistry28
Earth sciences1
Electronics1
General6
Information technology1
Mathematics1
Metallurgy2
Oil / petroleum16
Perfume30
Pharmacology7
Plastics41
Polygraphy1
Polymers1
Space2
Statistics4
Technology14
Telecommunications1
Textile industry1
United Nations1
Water resources4

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