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【单选题】
简单随机抽样是指对总体单位A.
不加任何处理进行抽取
B.
按期某种特征分类后在每一个类别中进行抽取
C.
按照一定顺序排列后等距抽取
D.
按照某种特征分为若干群后以群体为单位进行抽取
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【简答题】Hardly A -[I had ] sat down when I B-[heard] C-[someone ] knock at the D-[door] .
【简答题】如何理解权益结合法?
【判断题】一测回中2c互差超限或化归同一起始方向后,同一方向值各测回互差超限时,应重测超限方向并联测零方向(起始方向的度盘位置与原测回相同)。因测回互差超限重测时,除明显值外,原则上应重测观测结果中最大值和最小值的测回。
A.
正确
B.
错误
【单选题】Can you the price? I can't afford so much money. [ ]
A.
go down
B.
bring down
C.
put down
D.
take down
【简答题】Last Friday, I was coming home late after spending time with friends and thought I’d go down to the $99 cent pizza place. On the way, I saw a man sitting on the stairs alone there. I’d seen him before...
【单选题】I was twenty-five years old, and I'd just been (laid down) from my job as (division) manager (at) a (mortgage banking) firm.
A.
laid down
B.
division
C.
at
D.
mortgage banking
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