介绍了预先危险性分析的方法(P HA)和基本步骤，应用PHA分析工程系统中的可能潜在危险性，为在生产活动中采取相应的预防措施提供依据。
The method and steps of preliminary hazard analysis (PHA) is introduced. To analyze the possible hazards in engineering by PHA may help to bring forward related prevention measures.
在分析各个单元的主要危险、有害的基础上，进行了危险性预先分析表的编制；
On the major dangerous, harmful foundation of analysis every unit have carried out dangerousness the in advance analysis authorized strength of table;
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