Paper introduces a technique of the normal four-wheel tractor equipped with exhaust gas controlling device and designs a computer safety monitor system.

论述了在普通四轮拖拉机上加装废气控制装置的技术，设计了一种相配套的计算机安全监测系统。

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Hinder firearm to is it prevent flammable gas, liquid flame from spread and prevent flash back but cause safety device of explosion to used for.

阻火器是用来阻止易燃气体、液体的火焰的蔓延和防止回火而引起爆炸的安全装置。

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In various regions, different test gases are usually necessary to insure the quality, safety device and thermal characteristics of wall hung gas boiler.

为保证壁挂锅炉的质量，检测其安全装置和热工性能是否达到要求，需要根据不同地区的气源进行配气。

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