This paper gives the detail description of the safe system structure and its function in the oil field automation. Also, it gives the basic steps for safety system design by using PLC.

这篇文章对安全保护系统在油田自动化中的作用及组成给予了详细的描述，也给出了用PLC设计安全保护系统的基本步骤。

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Conclusion tie is a safe and effective therapeutic modality in treating PLC, and it can improve the cellular immune state of the patients with PLC significantly.

结论免疫栓塞治疗对原发性肝癌是一种安全有效的治疗方法，同时可改善肝癌患者的细胞免疫状态。

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Experimental result shows that PLC can meet the test requirements because it is safe, reliable, economical, convenient for operation, easy for maintenance and has a high degree of automation.

实验证明，PLC在真空预冷实验装置中安全可靠、经济实用、操作维护方便、自动化程度高，可满足试验要求。

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