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问题 单项选择题

假设投资者有10万元，想以如下的两种资产来构造组合：

①3个月国库券，收益率为6%。

②某风险资产，收益率为30%，标准差为40%。

如果投资者资产组合的标准差为30%，那么收益率是多少？（）

A．6%

B．12%

C．24%

D．30%

答案

参考答案：C

选择题

保护环境已成为人类的共识．人类应以可持续发展的方式使用资源，以合理的方式对废物进行处理并循环使用，下列做法不利于环境保护的是[ ]

A．发电厂的煤经脱硫处理

B．将煤转化为水煤气作燃料

C．回收并合理处理聚乙烯塑料废物

D．电镀废液经中和后直接排放

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单项选择题

It should go without saying that the focus of UML is modeling. However, what that means, exactly, can be an open-ended question. (71) is a means to capture ideas, relationships, decisions, and requirements in a well-defined notation that can be applied to many different domains. Modeling not only means different things to different people, but also it can use different pieces of UML depending on what you are trying to convey. In general, a UML model is made up of one or more (72) . A diagram graphically represents things, and the relationships between these things. These (73) can be representations of real-world objects, pure software constructs, or a description of the behavior of some other objects. It is common for an individual thing to show up on multiple diagrams; each diagram represents a particular interest, or view, of the thing being modeled. UML 2.0 divides diagrams into two categories: structural diagrams and behavioral diagrams. (74) are u sed to capture the physical organization of the things in your system, i.e., how one object relates to another. (75) focus on the behavior of elements in a system. For example, you can use behavioral diagrams to capture requirements, operations, and internal state changes for elements.

A. things B. picturesC. languages D. diagrams
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