3) gas examining instrument
瓦斯检器
4) optics coal gas analyzer
光学瓦斯检定器
1.
The paper analyses the causes of the optics path difference which come from the twocoherent lights that arc produced by interference system of the optics coal gas analyzer and re-searches the formation causes of the interference fringes and the interference types.
本文从对光学瓦斯检定器干涉系统两相干光光程差产生原因的分析，探讨其干涉条纹的成因和干涉类型。
5) gas detector relay
瓦斯检测继电器
6) approved gas detector
安全瓦斯检定器
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