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回炼次品时，会对产品质量有什么影响？

答案

参考答案：

在其它操作条件未变情况下，回炼次品时，汽油干点及柴油凝点会下降，所以要保证产品质量合格必须适当提高各部温度。

问答题

请按要求回答下列问题：

（1）盛放烧碱液的试剂瓶不能用玻璃塞，是为了防止发生______反应（用化学方程式表示），而使瓶塞与瓶口粘在一起；

（2）铝热反应在工业生产中的重要用途之一是______；

（3）“硅材料”又被称为信息材料．其中广泛用于光导纤维的材料是______（填化学式，下同）；广泛用于制造集成电路的材料是______．
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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. (1) 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 (2) . A diagram graphically represents things, and the relationships between these things. These (3) can be representations of realworld 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. (4) are used to capture the physical organization of the things in your system, i.e., how one object relates to another. (5) 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．Activity diagrams

B．Use-case diagrams

C．Structural diagrams

D．Behavioral
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