A.系統(tǒng)抽樣 B.分層抽樣 C.單純隨機(jī)抽樣 D.隨機(jī)抽樣
A.1/3 B.2/3 C.1/4 D.3/4
A.示值誤差為R% B.引用誤差為R% C.相對(duì)誤差為R% D.絕對(duì)誤差為R