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问题 单项选择题

下列GIS公用的开发方式中，目前较广泛采用的是（）。

A.独立式GIS二次开发

B.宿主式GIS二次开发

C.组件式GIS二次开发

D.开源式GIS二次开发

答案

参考答案：C

改错题

此题要求改正所给短文中的错误。短文中有10处错误，每句最多有两处。错误涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏词符号（）,并在此符号下面写出该加的词。

删除：把多余的词用斜线（\）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：

1、每处错误及修改均仅限一词。

2、只允许修改10处，多者（从第11处起）不计分。

Dear editor,

I’m a college student and I’ll graduating in half a year. I’m very worried about my future, because find a good job is so much difficult. At the moment, my parents want me to be a teacher, and I don’t like that idea. During my holiday break, I work part-time as a tour guide in my hometown. I liked job very much. But my parents didn’t agree with me. They thought the work was difficulty, even though one could make a lot of money. That is the most important to me is that being a tour guide won’t take me far from home. I always consider what my parents say, but it’s hard for me to take a decision. Could you give me some suggestion?
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单项选择题

数据库系统依赖于______支持数据独立性。

A．定义完整性约束条件
B．模式分级，各级模式之间的映射
C．具有封装机制
D．DDL语言与DML语言互相独立
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