Methods: The number of samples was calculated with the optimum allocation stratified random sampling survey.
应用最优分配随机分层抽样方法确定调查点.
Objective To apply blind for the results of a minimization random allocation system on Internet.
目的对基于网络的最小化随机化分组系统的分组结果设盲.
纳米英语 · 高考英语
纳米英语 · 双语娱乐资讯