單項選擇題關(guān)于激光的英文"laser",以下哪一項是正確的()

A.Lightactivation by stimulation emanation of radiation
B.Luminanta mplimeter by stimulation emission of radiation
C.Light activation by strong emission of radiation
D.Luminant activation before strong emission of radiation
E.Light amplification by stimulation emisssion of radiation


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1.單項選擇題抽樣誤差最大的抽樣方法是()

A.單純隨機(jī)抽樣
B.系統(tǒng)抽樣
C.分層抽樣
D.整群抽樣
E.先分層抽樣再整群抽樣