A.實(shí)驗(yàn)組間互為對(duì)照 B.實(shí)驗(yàn)和對(duì)照在同一受試對(duì)象身上進(jìn)行的對(duì)照 C.對(duì)照組不加任何處理的對(duì)照 D.實(shí)驗(yàn)組施加處理因素,對(duì)照組伴隨非處理因素的對(duì)照 E.將實(shí)驗(yàn)效應(yīng)與公認(rèn)的標(biāo)準(zhǔn)值或正常值作對(duì)照
A.空白對(duì)照 B.實(shí)驗(yàn)對(duì)照 C.標(biāo)準(zhǔn)對(duì)照 D.自身對(duì)照 E.相互對(duì)照
A.單純隨機(jī)抽樣 B.機(jī)械抽樣 C.分層抽樣 D.整群抽樣 E.分層整群抽樣