下面属于等级扩散的例子是( )。A．移民过程B．城市对周围农村的影响C．城市化的近域

Due to a constantly (66) environment, a poor understanding of the user’s needs and preferences, as well as a (67) of willingness to modify. (68) organizational structures and decision models, the full economic potential of Web Information Systems (WIS) has not been realized by now. The data object types of the (69) meta model, the Extended World Wide Web Design Technique (eW3DT), provide hypertext designers (70) a conceptual, user-centric framework and graphical notation for the construction of both, (71) and customized models, during the software development (72) of commercial WIS. A reference model as a normative concept represents an abstraction of a (73) company, its functional units, or its Web Information System and is intended to streamline the design and implementation of complex applications at (74) costs. As precondition for pursuing a partial globalization strategy,eW3DT (75) between technical and content-specific responsibilities for designing, implementing, and maintaining WIS.

（71）（）

A.exam

B.test

C.reference

D.specialize

我们所用电脑的硬盘都是经过分区的，由此可见硬盘不能作为一个整体使用。（）

女，55岁，曾患乙肝，肝硬化多年，右上腹胀痛1月余，CT检查如图所示，最可能的诊断是()

A．肝硬化腹水、下腔静脉血栓形成

B．肝硬化腹水、胆管细胞癌

C．肝硬化腹水、肝癌并下腔静脉癌栓

D．肝硬化腹水、肝脓肿

E．肝硬化腹水、肝血管瘤

根据题意回答以下问题： 设某商业集团数据库中有3个实体集：一是“商店”实体集，属性有商店编号，商店名，地址等；二是“商品”实体集，属性有商品号，商品名，规格，单价等；三是“职工”实体集，属性有职工编号，姓名，性别，业绩等。商店与商品间存在“销售”联系，每个商店可以销售多种商品，每种商品也可以在多个商店和职工间存在“聘用”联系，每个商店有许多职工，每个职工只能在一个商店工作，商店聘用职工有聘期和月薪。 问题： 1．请根据题意完善下面ER图。 2．将ER图转换成关系模型，并注明主键和外键。 3．请写出要查出员工“小李”在三月份的销售业绩的关系代数式。

哪些因素影响化学未完全燃烧热损失的大小？