Samples

random samples blood samples shot samples core samples grab samples engineering samples product samples convenience samples snowball samples blood sample random sample [化] 随机样本 [医] 随机样品 [经] 随机抽样, 随意抽取样品 shot sample core sample 岩样 engineering sample grab sample 定时取样; 定时试样; 随意取样; 抓毛样品