The nonstandard technique of using oxygen, deficiency capability of oxygen supplying equipment, the existed quality and design questions in lance, the unreasonable operation etc.
用氧技术不规范、供氧设备能力不足，喷头存在质量、设计问题，操作不合理等是影响氧枪枪龄的主要原因。
2
To avoid deficiency of empirical design method in our country, the subject worth while reference for electronic equipment design.
本课题对改进目前国内电子设备的经验设计方法中的一些不足有一定的参考价值。
3
A quantitative analysis equipment was created to determine the cold-intolerance behaviour of the model rabbit with Yang deficiency.