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等级标准
space grade standard
等 级标准
: 38 phrases in 21 subjects
Agriculture2
Animal husbandry6
Aviation1
Bridge construction1
Business2
China3
Commerce1
Ecology2
Economy1
Food industry1
General2
International trade1
Labor law1
Project management1
Reproductive biology1
Securities1
Space2
Technology6
Textile industry1
United States1
Wind Energy1

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