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【多选题】
关于概率抽样的基本原理,以下说法正确的是( )A.
概率抽样的目的是使得样本尽可能准确的反映总体所具有的内在异质性结构
B.
总体中的个体间的异质性是概率抽样的必要性所在
C.
研究者在实际抽样中基本上都采取不放回抽样的方式，这是因为总体中任何一个元素的抽取都丝毫不会影响到其它元素被抽取的概率
D.
概率抽样中的随机抽样是为了保证总体中的每一个个体都有同等机会入选样本
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【简答题】频繁地、经常地
【单选题】There are two factors which determine an individual's intelligence. The first is the sort of brain he is born with. Human brains differ considerably, some being more capable than others. But no matter...
A.
Measuring Your Intelligence
B.
Intelligence and Environment
C.
The Case of Peter and Mark
D.
how the Brain Influences Intelligence
【单选题】There are two factors which determine an individual's intelligence. The first is the sort of brain he is born【C1】______. Human brains differ considerably,【C2】______being more capable than others.【C3】_...
A.
for
B.
by
C.
with
D.
in
【判断题】Since straight B/L bears higher risk than the open B/L, it is rarely used in international transportation.
A.
正确
B.
错误
【单选题】打电话时,反映出个人的品德和修养,可以给对方一个良好的印象,哪么打电话时,哪一点是不可取的
A.
尽快接听电话，最好铃声不超过三次
B.
如通话结束，受话人先将电话挂断
C.
通话时，注意力要集中
D.
一般情况下，不在清晨、午睡、深夜或用餐时间打电话
E.
学习、开会期间应关掉手机
【简答题】adv . 经常地;定期地
【判断题】Since straight B/L bears a higher risk than the order B/L, it is rarely used in international transportation.
A.
正确
B.
错误
【判断题】There are two explanations of constant opportunity costs: (1) factors of production are imperfect substitutes for each other; (2) all units of a given factor have different qualities.
A.
正确
B.
错误
【单选题】There are two factors which determine an individual's intelligence. The first is the sort of brain he is born【B1】. Human brains differ considerably,【B2】being more capable than others.【B3】no matter how...
A.
for
B.
by
C.
with
D.
in
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