A.2% B.3% C.4% D.5%
A.單層制下的兩會(huì)結(jié)構(gòu) B.雙層制下的兩會(huì)結(jié)構(gòu) C.單層制下的三會(huì)結(jié)構(gòu) D.雙層制下的三會(huì)結(jié)構(gòu)
A.判斷抽樣 B.隨機(jī)抽樣 C.定向抽樣 D.重點(diǎn)抽樣