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问题 选择题

物质发生化学变化的实质是（　　）

A．物质的形态发生了变化

B．发光、发热

C．原物质生成了其他的物质

D．逸出气体或析出沉淀物

答案

化学变化是产生新物质的变化，在化学变化中原物质发生了变化，变成了其它新物质．

故选C

单项选择题

Accelerated analysis approaches emphasize the construction of (8) to more rapidly identify business and user requirements for a new system. As an accelerated analysis technology, (9) reads the program code and automatically generates the equivalent system model, and the code can be obtained from (10) All system analysis approaches require some form of (11) which includes those techniques to be used to identify or extract system problems and solution requirements from user community. (12) is a classical set of techniques used to collect information about system problems, opportunities, solution requirements, and priorities.

9（）

A. eXtreme programming

B. model driven

C. reverse engineering

D. agile method
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单项选择题

胰十二指肠切除术后，持续胃肠减压2周，无排气，腹部无压痛，肠鸣音减弱，T波低平，考虑存在（）

A．低钾血症

B．等渗性缺水

C．高渗性缺水

D．低渗性缺水

E．低钙血症
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