| 1. | We call a path open if all of its edges are open . if an open path has infinite length , we call it infinite open path
如果路上的每一条边均为开边，则称此路为开路。 |
| 2. | Specification for open path apparatus for the detection of combustible or toxic gases and vapours - general requirements and test methods
可燃的或有毒性的气体和蒸气的检测用开路仪器规范.一般要求和试验方法 |
| 3. | Specification for open path apparatus for the detection of combustible or toxic gases and vapours - part 1 : general requirements and test methods
可燃或毒性气体和蒸气的检测用开路仪器规范.第1部分:一般要求和试验方法 |
| 4. | Specification for open path apparatus for the detection of combustible or toxic gases and vapours - part 1 : general requirements and test methods ; german version en 50241 - 1 : 1999
可燃或毒性气体和蒸气的检测用开路仪器规范.第1部分 |
| 5. | Specification for open path apparatus for the detection of combustible or toxic gases and vapours - part 1 : general requirements and test methods ; german version en 50241 - 1 : 1999 a1 : 2004
可燃或毒性气体和蒸气的检测用开路仪器规范.第1部分 |
| 6. | Arjuna , happy are the upholders of justice who achieve a battle of this kind presented by its own accord and which is a wide open path to the heavenly planets
阿诸那啊，坚持正义的人们，因为赢得这不期而遇的战役而幸福快乐，因为那是通往天界的光明大道。 |
| 7. | O arjuna , happy are the upholders of justice who achieve a battle of this kind presented by its own accord and which is a wide open path to the heavenly planets
阿诸那啊，坚持正义的人们，因为赢得这不期而遇的战役而幸福快乐，因为那是通往天界的光明大道。 |
| 8. | Specification for open path apparatus for the detection of combustible or toxic gases and vapours - performance requirements for apparatus for the detection of combustible gases
可燃的或有毒性的气体和蒸气的检测用开路仪器规范.可燃气体检测用仪器的性能要求 |
| 9. | Specification for open path apparatus for the detection of combustible or toxic gases - part 2 : performance requirements for apparatus for the detection of combustible gases ; german version en 50241 - 2 : 1999
易燃或有毒气体和蒸汽气检测用开路仪器规范.第3部分 |
| 10. | Specification for open path apparatus for the detection of combustible or toxic gases and vapours - part 2 : performance requirements for apparatus for the detection of combustible gases
可燃或毒性气体和蒸气的检测用开路仪器规范.第2部分:可燃气体检测仪器的性能要求 |
