hard coal造句
1 The driest and hardest coal is anthracite.
2 Pyrolysis performance of admixture with hard coal and corn stalk in different heat rate.
3 The respect is exported in coking hard coal, present manufacturing cost lowest of the United States.
4 The first caving roof sections in hard coal layers can effectively reduce the pressure during the course of caving and guarantee safe production and efficiency.
5 One topic of high-performance underground hard coal production gaining increasing importance is that of efficient gas removal.
6 Drilling borehole in hard coal seam is mostly used to discharge gas, and cross layer borehole,[www.] roof rock borehole and laneway are mainly used to discharge gas in soft coal seam.
7 Based on the difference between hard coal and deformed soft coal on physical characteristics, analyzing the response that deformed soft coal seam is on well log.
8 Gelsenkirchen was mentioned in a document for the first time in 1147. The discovery of hard coal in mid- 1900 triggered the industrialisation of the Gelsenkirchen area.
9 The paper held that the two leg shield caving powered support would not be suitable for the top coal caving mining in the hard coal seam and the joint crack undeveloped medium hard seam.
10 A special mining subsidence case was introduced here. That is, total collapse of overlying rock for hard coal, hard roof and overlying strata in Datong Mining Area.
11 F. injection are measured and the experimental studies on the pulverized bituminous and hard coal mixing-injection are made.