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问题 单项选择题

通过考察收益和成本如何根据价格的变化而变化，管理人员能够确定（）

A．盈亏平衡价格

B．边际利润价格

C．利润最大化价格

D．弹性价格

答案

参考答案：C

解析：

利润最大化价格是通过考察收益和成本如何随着价格的变化而变化来得出的。

阅读理解

根据上面的对话内容，完成Tom的家谱图。

Peter: Look, it's Tom's family photo.

Jim: Is this his sister?

Peter: I don't know. Tom, is this your sister?

Tom: Yes, it's my elder sister. Her name is Linda.

Jim: How about this woman? Is she your mother?

Tom: No. She is my aunt. Her name is Carol. Those are my parents. My father Frank is a doctor

        and my mother Sarah is a professor (教授).

Peter: Who's this baby then?

Tom: It's my cousin. She is Allen and Carol's daughter. Her name is Sally. She is only 3 years old.

Jim: She is so cute. These two people are your grandparents, aren't they?

Tom: Yes, they are. They are both teachers. Their students call them Mr and Mrs Green.

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选择题

若水平恒力F在时间t内使质量为m的物体在光滑水平面上由静止开始移动一段距离s，则2F的恒力在2t时间内，使质量为m／2的物体在同一水平面上，由静止开始移动的距离是[ ]

A．s 　　

B．4s 　　

C．10s 　　

D．16s

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