In this paper, hazard theory is combined with coal mine gas accident and coal mine hazard is put forward, analyzing gas accident hazard by the three class of hazard.
本文将危险源理论和煤矿瓦斯事故相结合，提出煤矿危险源这一全新概念，用三类危险源思想来分析瓦斯事故危险源。
According to the ore-forming depth and condition of physical-chemical, these deposits may be classified into three class: deep-zone type, mesozone type and epizone type.
依矿床形成深度和物理化学条件等差异，将其划分为深部带型、中部带型和浅部带型三亚类。
Whereas Airbus markets the A340-500 with 313 seats in a three-class configuration, SIA has designed the aircraft with only 181 seats including 64 in business class.
空客公司向市场推出的A340- 500型飞机有3个等级、313个座位，但新加坡航空公司将飞机改装后，将只有181个座位，其中64个在商务舱内。
Whereas Airbus markets the A340-500 with 313 seats in a three-class configuration, SIA has designed the aircraft with only 181 seats including 64 in business class.
空客公司向市场推出的A340- 500型飞机有3个等级、313个座位，但新加坡航空公司将飞机改装后，将只有181个座位，其中64个在商务舱内。
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