单项选择题
A.光致压强效应 B.光致化学效应 C.光致强电场效应 D.光致裂变效应 E.光致热效应
A.方向性强 B.相干性好 C.穿透性强 D.单色性好 E.极化性高
A.Lightactivation by stimulation emanation of radiation B.Luminant amplimeter by stimulation emission of radiation C.Lightactivation by strongemission of radiation D.Luminant activation before strong emission of radiation E.Light amplification by stimulation emisssion of radiation
A.单纯随机抽样 B.系统抽样 C.分层抽样 D.整群抽样 E.先分层抽样再整群抽样
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