题目内容

UML结构包括了基本构造块，公共机制和 (1) 。UML中提供了扩展机制，其中，构造型(Stereotype)扩展了UML的 (2) ，约束(Constraint)扩展了UML (3) 。

A. 构造块的特性，允许创建详述元素的新信息
B. 构造块的语义，允许增加新的规则或修改现有的规则
C. 语意，允许创建新的构造块
D. 词汇，允许创建新的构造块

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A typical (36) language contains an applicative sub-language which approximates the mathematical abstractions of "timeless" functions applied to’ "spaceless" values, where the actual operation sequences and use of storage space during expression evaluation are organized behind the (37) . In this setting, values are data structures of low volume, typically a few computer words or less, which means that an illusion of spacelessness can be realized by having (38) results during expression evaluation stored at the discretion of the language implementation, and effecting parameter (39) and (40) operations through value copying. 39（）

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