The paper analyzed the design defect of Model 2550 micro oxygen analyzer, introduced the modification solution and design principle and attention rule.
分析了原2550型微量氧分析仪采样系统设计缺陷，阐述改造方案和设计原理及使用注意事项。
This article elucidates the great significance of the application of the attention rule to physical education by expounding voluntary attention, involuntary attention and their interrelations.
通过对有意注意和无意注意及其相互间关系的阐述，探究了注意规律在体育教学中的应用的重要意义。
This article elucidates the great significance of the application of the attention rule to physical education by expounding voluntary attention, involuntary attention and their interrelations.
通过对有意注意和无意注意及其相互间关系的阐述，探究了注意规律在体育教学中的应用的重要意义。
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