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случайная выборкаstresses
ed. 随机抽样
el. 随机取样
math. 随机样本; 随机抽样法; 概率取样; 随机试样; 随机示样; 随机选取
tech. 遇机抽样
случайная выборка: 15 phrases in 6 subjects
Business2
Education1
Electronics2
Finances1
General4
Mathematics5