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research test
plast. 研究性试验
space 研究试验
research test
: 68 phrases in 18 subjects
Air defense2
Aviation14
Business7
Chemistry1
Dermatology1
Earth sciences8
Economy1
Electronics6
General2
Hydroelectric power stations1
Information technology2
Mining2
Plastics1
Project management1
Space16
Technology1
United Nations1
United States1

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