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问题 单项选择题

在蜂窝结构夹芯塞的修理过程中，通过把夹芯塞放在丙酮或MEK溶液中浸泡进行清洁处理，浸泡时间不能超过：（）。

A、10秒

C、120秒

B、240秒

D、60秒

答案

参考答案：D

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 used 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.

（73）处填（）。

A．things

B．pictures

C．languages

D．diagrams
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填空题

如图所示是甲、乙两种固体物质的溶解度曲线，请回答下列问题：

（1）t1℃时，甲物质的溶解度    乙物质的溶解度（填“＞”、“=”或“<”）。

（2）甲、乙两种物质的溶解度受温度影响较小的是     物质。

（3）t2℃时，把100g乙物质放入100g水中，充分搅拌，所得溶液是          溶液（填“饱和”或“不饱和”）
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