A.10%,10,300 B.20%,10,300 C.10%,5,200
A.3 B.4 C.5 D.6
A.隨機(jī)抽樣檢驗(yàn) B.簡(jiǎn)單隨機(jī)抽樣 C.整群抽樣 D.等距抽樣