抽样sample;sampling详细»
抽样sampling详细»
抽样drawn sample详细»
抽样sampling;spot check详细»
抽样random sampling;sample;sample drawing;sampling at random;spot check;spotcheck详细»
抽样sampling action详细»
抽样random sampling;sample drawing详细»
抽样sampling详细»
抽样spot check;spotcheck详细»