underground workings meaning in Chinese

地下井巷

Mine plans ; deep mining ; underground workings
矿山测量平面图.地下采矿.巷道
Mine plans ; deep mining ; underground workings ; comments
矿区平面图.深井开采.井下巷道.说明
Mine plans - deep mining - part 11 : geometrical dimensions in underground workings
矿山平面图.地下采矿.第11部分:地下巷道的几何尺寸
Reciprocating internal combustion engines - safety requirements for design and construction of engines for use in potentially explosive atmospheres - part 2 : group i engines for use in underground workings susceptible to firedamp and or combustible dust
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2部分:在地下工作时易受沼气和或可燃性粉尘影响的i组发动机
Reciprocating internal combustion engines - safety requirements for design and construction of engines for use in potentially explosive atmospheres - group i engines for use in underground workings susceptible to firedamp and or combustible dust - part 2 : group i engines for use in underground workings susceptible to firedamp and or combustible dust
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.用于地下工作时对沼气和或可燃性尘土敏感的i组发动机.第2部分:用于地下工作时对沼气和或可燃性尘土敏感的i组发动机