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问题 填空题

导线接线处如果接触不良，会使接触处电阻变______，同样电流相同时间内产生的热量会______，容易引起火灾．夏天空调器的风扇会向室外吹出大量的热，这些热量产生的原因与导线变热的原因______（填“相同”或“不相同”）．

答案

（1）导线接触不良处电阻变大，根据焦耳定律知，同样电流相同时间内，电阻增大，电流产生的热量增加．

（2）空调是通过汽化吸收热量把热量带走，和电流产生的热量是不同的．

故答案为：大；增加；不相同；

单项选择题

厚朴内表面上发亮的细小结晶是

A．厚朴酚结晶

B．碳酸钙结晶

C．草酸钙结晶

D．淀粉粒

E．牡丹酚结晶
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单项选择题

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.

（70）（）

A.give

B.above

C.presented

D.got
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