多项选择题

在一定业务量范围内，下列有关成本的表述，正确的有()

A.固定成本总额保持不变
B.单位固定成本保持不变
C.混合成本总额不随业务量的变动而变动
D.变动成本总额随着业务量的变动而成正比例变动
E.单位变动成本随着业务量的变动而成反比例变动

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单项选择题

9. Cocoa butter melts at the same temperature as that of the human body. Does it explain why we like chocolate? A、Yes. The passage indicates there is a strong relation between the temperature of coca butter and the taste. B、 No. The passage suggests there may be a genetic trait for liking chocolate. C、Yes. The passage shows that chocolate helps release hormones in the brain. D、No. The passage suggests there may be a personal preference for liking chocolate.

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生产力与生产关系、经济基础与上层建筑的矛盾贯穿社会发展始终，是其他社会矛盾最为深刻的_____，决定并制约着其他社会矛盾的存在和解决。

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