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【多选题】
物流信息系统的层次结构包括( )。A.
作业系统
B.
管理控制
C.
决策分析
D.
战略规划
E.
信息管理
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举一反三
【简答题】推断性统计的基本任务有两点:通过 、P来估计 μ ,π等,称为 ,能过P 1 ,P 2 来判定总体 π 1;, π 2 是否相等的问题,称为 。
【判断题】The cost of insuring a diversified risky portfolio against a loss is almost lower than the cost of insuring against each risk separately.
A.
正确
B.
错误
【判断题】The cost of insuring a diversified portfolio of risks against a loss is almost more than the cost of insuring against each risk separately.
A.
正确
B.
错误
【多选题】生产关系对生产力具有能动的反作用,表现在:
A.
当生产关系适合生产力发展的客观要求时，对生产力起推动作用
B.
当生产关系落后生产力时会阻碍其发展
C.
当生产关系超越生产力水平时会促进其发展
D.
当生产关系总体上基本适合生产力发展时，不排除它的某些环节或方面不适合生产力状况而阻碍其发展
【单选题】听力原文：W: Hi, John. M: Hi, Jenny. W: One of the issues today is the digital divide. What does it mean? M: It refers to the divide between who is online and who isn't. W: What's the nature of the breakdo...
A.
Income is the main factor that determines who are online and who are not.
B.
The digital divide is determined by factors such as income, race and age.
C.
More and more people in the United States will go online in the near future.
D.
Both men and women are interested in going online but they visit different sites.
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