题目内容
Modern teaching mostly combine multimedia to present the main teaching content. Teachers would like to take the content on multimedia as the main board writing.and the blackboard as the attached board writing.
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schematic diagram is not conductive to present teaching content visually, facilitate students to find the connection between knowledge points and help to cultivate students' observation and thinking ability.
P6.1.4是第几层的数据处理?
数据流程图有四种基本元素分别是外部实体、、处理过程和数据存储。
在数据流程图里面要避免出现黑洞现象，所谓黑洞就是只有输入、没有输出。
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