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to phrases
free nitrogen
agric.
游离氮
oil
单体氮
free nitrogen
:
29 phrases
in 15 subjects
Agriculture
5
Animal husbandry
6
Chemistry
2
Desert science
1
Earth sciences
1
Ecology
1
Food service and catering
2
Geology
1
Metallurgy
3
Microbiology
2
Oil processing plants
1
Polymers
1
Space
1
Technology
1
Water resources
1
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