單項(xiàng)選擇題激光的特點(diǎn)以下哪一項(xiàng)有誤
A．方向性強(qiáng)
B．相干性好
C．穿透性強(qiáng)
D．單色性好
E．極化性高
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1.單項(xiàng)選擇題關(guān)于激光的英文"laser"，以下哪一項(xiàng)是正確的
A．Lightactivation by stimulation emanationofradiation
B．Luminant amplimeter 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
2.單項(xiàng)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
