多项选择题

‌中国人民的伟大民族精神包括（）‌
‌‌

A．伟大团结精神
B．伟大创新精神
C．伟大奋斗精神
D．伟大梦想精神

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单项选择题

对于不做非膨胀功的单组分均相封闭系统，的值必然 A、大于零； B、等于零； C、小于零； D、无法确定。

单项选择题

Which of the following is NOT a reason for selecting a sample? A) A sample is less time consuming than a census. B) A sample is less costly to administer than a census. C) A sample is usually not a good representation of the target population. D) A sample is less cumbersome and more practical to administer

A．A sample is less time consuming than a census.
B． A sample is less costly to administer than a census.
C．A sample is usually not a good representation of the target population.
D．A sample is less cumbersome and more practical to administer.

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