proportional sampling
... proportional reset controller 比例重整调节器 proportional sampling 按比例取样 proportional tax 比例税 ...
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按比例取样器 proportional sam pling device
按时间比例取样 [电子] time-proportioned sample
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方法问卷法、跨文化比较法及随机抽样调查，按各村18岁至45岁人口比例抽取样本。
Methods Applying answering questionnaires, contrasting cross culture and getting the sample at random. Then we chose each village came from 18 to 45 year-old sample.
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