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to phrases
proportional sampling
auto. 排气分析比例取样
ecol. 按比例采样
interntl.trade. 比例抽样
math. 比例抽样法; 按比例抽样
oil 按比例取样
tech. 比例取样; 比例抽样法比例采样
proportional sampling: 16 phrases in 8 subjects
Business2
Commerce1
Economy2
Electronics1
Forestry1
Marketing2
Statistics2
Technology5

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