An airship is a lighter than air aircraft . it has twin engines and uses " helium " , a non - flammable gas , as a lifting gas which is contained in a large envelope 飞船是较空气为轻的飞行器，置有两个发动机，并依靠注入于大型气囊的不燃气体氦推动其上升。
Electrical apparatus for the detection and measurement of flammable gases - performance requirements for group i apparatus indicating a volume fraction up to 5 % methane in the air 可燃性气体的检测和测量用电气装置.指示空气中甲烷含量达到体积分率为5 %时i组装置的性能要求
Electrical apparatus for the detection and measurement of flammable gases - performance requirements for group i apparatus indicating a volume fraction up to 100 % methane in air 可燃性气体的检测和测量用电气装置.指示空气中甲烷含量达到体积分率为100 %时i组装置的性能要求
Electrical apparatus for the detection and measurement of flammable gases - performance requirements for group ii apparatus indicating a volume fraction up to 100 % lower explosive limit 可燃性气体的检测和测量用电气装置.指示低爆炸极限达到体积分率为100 %时ii组装置的性能要求
The product is widely used in the fields of flammable gas , petroleum , chemistry , fire protection , metallurgy , pharmacy , hotel and mine industries where the flammable , explosive and poisonous gas exists 产品广泛应用于燃气、石油、化工、消防、冶金、制药、酒店、矿井等存在易燃、易爆、毒性气体的危险场所。
Reciprocating internal combustion engines - safety requirements for design and construction of engines for use in potentially explosive atmospheres - part 1 : group ii engines for use in flammable gas and vapour atmospheres 往复式内燃机.在潜在爆炸环境下使用的发动机设计和构造的安全性要求.第1部分:在可燃气体和蒸气环境中使用的ii组发动机
Reciprocating internal combustion engines - safety requirements for design and construction of engines for use in potentially explosive atmospheres - group ii engines for use in flammable gas and vapour atmospheres - part 1 : group ii engines for use in flammable gas and vapour atmospheres 往复式内燃发动机.用在潜在爆炸气体环境下发动机结构和设计安全要求.用于可燃气体和蒸气环境的ii组发动机.第1部分:用于可燃气体和蒸气环境的ii组发动机
( 3 ) a testing system consisting of pressure transducers , data - collecting card , computer and electrical - ignition instrument was designed and a flammable gas cloud deflagration experimental system was developed . based on the orthodoxy experiments , the experiments was conducted on c2h2 - air flame acceleration resulted from hemispherical porous barriers in hemispherical gas cloud . the relations between the explosion overpressure and its influence factors were summarized ( 3 )本文设计了由压力变送器、数据采集卡、计算机和电火花装置组成的测试系统，建立了可燃气云爆燃实验系统；以化学计量浓度的乙炔-空气混合物为实验介质，在正交实验的基础上，对半球形气云内部与气云同心的半球形多孔障碍物对火焰的加速作用进行实验研究，并归纳出爆炸超压与其影响因素之间的关系；同时还考察了障碍物数量对爆炸超压的影响。
