皮皮学，免费搜题
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【多选题】
下列选项中，分层选样法的优点包括（）。A.
减少样本的非抽样风险
B.
将样本的选择与总体中的关键项目联系起来
C.
将相对同质的项目划为一类，可提高样本在其所在层次的代表性
D.
对于项目之间特征差异较大的总体的样本选择更具优越性
E.
无偏见地选取样本项目
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】My father __ my uncle when he went to Shanghai on business. [ ]
A.
dropped off
B.
dropped into
C.
dropped by
D.
dropped out
【简答题】He’s dropped (= given) several ____to the boss that he’ll quit if he doesn’t get a promotion.
【简答题】新民主主义革命的三大法宝
【单选题】_____in physical shape, he dropped out of the University of Syracuse.
A.
As he was bad
B.
Bad as he was
C.
Bad although he was
D.
Bad though he was
【单选题】Rewrite the following sentence using the cue and inversion: If he had understood the situation, he would have quit. (had)
A.
Should he had understood the situation, he would have quit.
B.
Had he undersood the situation, he would have quit.
C.
Did he have understood the situation, he would have quit.
【简答题】新民主主义革命的三大法宝
【简答题】A．He hit it with a ball. B．He accidentally dropped it. C．He tried to piece it together with super glue. D．He bumped into it with his arm.
【简答题】He has dropped several _______ to the boss that he’ll quit if he doesn't get a promotion.
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