Quality control is the key part of the manufacturing process.

质量管理是制造工序的关键部分。

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The math model and control system design after modeling are the base and key point to process control system analyses, design, debug and obtain the higher control quality.

掌握被控对象的数学模型和建模后控制系统的设计，是过程控制系统分析、设计、调试和获得较高控制品质的基础和关键。

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Because flame stability control is the key to assure process quality, the two-step decompression method is used to control the flow of flame gas.

因火焰稳定性控制是保证该工艺质量的关键，所以采用二级减压方法对火焰气体流量进行控制。

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