通过对液氯钢瓶瓶阀故障类型、原因的分析，提出了在钢瓶使用、充装、检验过程中适当的操作方法和对策。

By analysis of valve fault type and causes of liquid chlorine cylinder, this paper offers proper operation methods and counter-measures in use, filling and inspection processes.

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介绍了用美国DV - 4光电光谱仪分析502铝合金的试验研究过程和操作方法。

Test and research process and operation method of 502 aluminum alloy analyzed by DV-4 photoelectric spectrometer from American are introduced.

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主要介绍该方案的具体操作方法、数据处理、误差分析及总结的初步经验。

This paper mainly introduces the concrete operation, data process, error analysis and initial experience.

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