用“soft coal”造句大全，soft coal造句

9、The caving reasons of the rib area in front of supports is analyzed, at the fully mechanized caving coal face, in the hard roof, soft coal, soft bottom and large inclination thick coal bed.

12、There are many kinds of forms of gas discharge, but the main form is soft coal seam gas discharge.

15、As well as the related information of deformed soft coal in study area was got by this technology; dangerous districts of coal and gas outburst were forecasted in study area.

18、The project takes pyrogenic dry distillation gas of soft coal in continuous retort as the fuel gas and produces ferroalloy coke and crude tar oil.

21、At the present, the problem which is urgently to be solved in gas discharge is the drilling technology in soft coal seam gas discharge, especially the drilling technology of the deep hole.

3、Integrated technology for fully mechanized top coal caving mining face in steep inclined seam with hard roof,soft floor and soft coal

6、However, with the extension of mining depth, the distribution of soft coal seam has been expanding.

10、It has good coal adaptability and is especially suitable for soft coal that has high tar content and big gas output.

14、Finally great depth of burial, long time and higher temperature may metamorphose the lignite into soft coal or bituminous coal and in extreme cases, to hard coal or anthracite.

19、The II3123 face is a light type caving face of three-soft coal seam. the roof is cracked, sloughing and roof fall often occur.

2、This paper puts forward support plan through analyzing strata behavior regularity of coal roadway in seam with soft roof, soft coal and soft floor.

7、Study on fastly extincting burst technique when tunneling in soft coal seam

13、Reserving space for lane along the tunnel under the condition of soft coal bed,compound roof supports and protections;

20、I still think I just and opposition the wind merely top of the appearance is very handsome, immediately just knows, UGG Stivali age, and originally whole a soft coal pellet mushrooms a sky.

5、Plowability of plow mining on thin and soft coal seam with hard roof

16、after more burial and chemical transformation of the aging organic material, the peat becomes lignite, a very soft coal-like material.

4、The paper introduces some mining measures in soft coal seam of Linnanchang Mine and soft floor by leaving top coal. The measurements ensure safety mining.

17、Along with the mines toward deep level in China, the problems of soft rock are becoming more and more outstanding, especially controlling surrounding rock of three-soft coal seam.

11、As the soft coal seam is high gas content and low permeability. it has been difficult and key for the coal seam gas extraction.

1、There are three coal mines in Xin'an Coalfield. The Shanxi group irregular(2-1) coal seam has soft roof, soft coal and soft floor.

8、The combustion characters of petroleum coke were between those of soft coal and anthracite .