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first-class certificate
busin. 一级证券; 一级品证书
econ. 一级证书
tech. 一等证书
first class certificate
avia. 一级执照
busin. 一级品证明书
exhib. 一级证书
interntl.trade. 一级证券
telecom. —级证件; 甲级文凭