主要分析了工程测量教学中误差基本概念的应用，描述了偶然误差和闭合差等概念，举出了教学中的一些例子。
The paper analyses the teaching of Engineering Survey, describes the basic concepts of error including the definitions of accident error and closure, and finally provides examples for teaching.
目的：分析调强放疗的偶然误差及其在临床中的应用。
OBJECTIVE: To study the random error and its clinical application in analyzing intensity modulated radiation therapy (IMRT).
目的：分析调强放疗的偶然误差及其在临床中的应用。
OBJECTIVE: To study the random error and its clinical application in analyzing intensity modulated radiation therapy (IMRT).
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