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【判断题】
成本等于产品价格 乘以数量,收益等于生产要素的价格乘以数量。A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【简答题】Child mortality (死亡率) decreased due to improvements in medical care and greater attention to problems related to proper ________.(gigantic; standpoint; evacuate; naïve; permeate; nutrition; inflict; s...
【简答题】Liam works in Sydney. Last week he had 41 holiday, but he didn’t know 42 to go. He said to his friend Robert, “I 43 the hot weather here, but I can’t find a cool place in Australia. How will I spend m...
【单选题】I _______rather have taken his advice. He is the last person who will betray you in the world.
A.
would
B.
should
【简答题】先将总体划分成若干群,然后以群作为抽样单位从中随机抽取部分群,再对抽中的各个群中所包含的所有元素进行观察。该抽样方法为( )。
【单选题】Child mortality (死亡率)decreased due to improvements in medical care and greater attention to problems related to proper________.
A.
resident
B.
massacre
C.
convict
D.
nutrition
【单选题】How does Will feel in his last times from the passage? (from P.470-476)
A.
He looks anxious and guilty
B.
He is pretty composed and relaxed
C.
He feels pressured and reluctant
【简答题】Whether he will invest his last sum in that project is a case of _____ or swim for him.
【简答题】设随机变量X和Y的相关系数为0．9，若Z＝X－0．4，则Y与Z的相关系数为________．
【单选题】将总体中的全部个体区分为容量及结构相似的不同的子总体,以子总体为单位按照简单随机抽样的方法抽取一定数量的子总体,再将这些被抽中的子总体中所包含的个体合并起来形成最终的样本,这种抽样方法称作
A.
分层抽样
B.
系统抽样
C.
简单抽样
D.
整群抽样
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