安全高效
safe and high-efficient utilization
Safety and High Efficiency
Safety and efficient
Safety and highly effective
safe and highly efficient
Safe and Efficient
煤与瓦斯安全高效共采
safe and high-efficient exploitation of coal and g
safe and high-efficient exploitation of gas and co
中国矿业大学煤炭资源与安全开采国家重点实验室
State Key Laboratory of Coal Resources and Safe Mining
China University of Minng Technology
最小安全开采深度
Minimum safe mining depth
5tX-Y高安全葫芦
5 t X-Y high security hoist
安全高电压接头
safe high voltage connector