多阶抽样
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Multi-level sampling 多水平取样 ; 多级抽样
multi level sampling interpretation approach 多阶抽样解译法
multi-level continuous sampling plans 多水准连续抽样计画
tightened multi-level continuous sampling plan 加严多水平连续抽样方案
sampling plan multi-level 多层次抽样计划
multi level sampling
多级抽样
以上为机器翻译结果,长、整句建议使用 人工翻译 。
Methods Using multi-level sampling method, 638 subjects were selected randomly and surveyed. The serological specimens from 638 subjects were separated and detected using haemoglutinin inhibition(HI).
方法采用多阶段抽样方法,随机抽取638名调查对象进行个案调查并采集血液标本分离血清,用血凝抑制(HI)方法对标本进行检测。
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