hard coal

In coal gas drilling, coal collapse led to drilling hard trip and other accidents.

在煤层气钻井中, 煤岩坍塌造成接单根困难、起下钻遇阻遇卡、蹩泵等事故和井下复杂.

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hard coal - determination of the crucible swelling number

硬煤.坩埚膨胀指数的测定

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Xinli mining area of Sanshandao gold deposit is the first hard rock mine which belongs to the under-sea deposit in our country, and only Longkou is mining coal under sea in domestic.

三山岛金矿新立矿区是我国第一个进行海底采矿的硬岩矿山，国内仅龙口在海下采煤。

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Hoist, ventilator, air pressure machine and water pump are main fixed equipment which play important roles in coal mine production and consume most of the power. Traditional testing by manual is hard to satisfy the demands of determining operating status and technical parameters.

提升机、通风机、空压机、水泵是煤矿生产建设中起重要作用并且耗电量占很大比重的主要固定设备，对这些设备的运行状况和技术参数的确定，传统的人工测试已经很难满足。

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hard coal and coke - mechanical sampling - part 6: coke; preparation of test samples

硬煤和焦炭.机械取样.第6部分：焦炭.试验样品的制备

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Small traders find it hard a foothold in the export of coal to Japan.

小的贸易商在对日的焦煤出口中不好插足.

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Under Datong two hard conditions coal plow system research and application

大同两硬条件下刨煤机系统的应用实践

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methods for froth flotation testing of hard coal - evaluation of flotation characteristics

硬煤泡沫浮选试验方法。浮选性的评定

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hard coal and coke -- mechanical sampling -- part 7: methods for determining the precision of sampling, sample preparation and testing

硬煤和焦碳—机械取样—第7部分：测定取样精确度、样品制备和试验的方法

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hard coal and coke -- mechanical sampling -- part 8: methods of testing for bias

硬煤和焦碳—机械取样—第8部分：偏差试验方法

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hard coal and coke - mechanical sampling - sampling from moving streams

硬煤和焦炭.机械取样.流水线上的取样

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hard coal and coke - mechanical sampling - part 2: coal; sampling from moving streams

硬煤和焦炭。机械取样。第2部分：煤。流动取样

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hard coal and coke - mechanical sampling - coal - sampling from stationary lots

硬煤和焦炭.机械取样.固定批量取样

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Throwing a pick around in a coal mine& that's hard work.

就像用鹤嘴锄在煤矿里挖煤，这是项非常辛勤的工作。

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Caving mining under the condition of hard coal and rock

坚硬煤岩条件下放顶煤开采

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hard coal and coke - mechanical sampling - methods for determining the precision of sampling, sample preparation and testing

硬煤和焦炭.机械取样.取样精度测定方法、样品制备和试验

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Study of Pre-cracking Hard Coal by Water Infusion in Sub-level Caving Mining

坚硬煤层放顶煤注水弱化研究

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hard coal and coke - mechanical sampling - coke - preparation of test samples

硬煤和焦炭.机械取样.焦炭.试样制备

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hard coal. size analysis by sieving.

硬煤.用筛分进行粒度分析

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solid mineral fuels. method of sampling of hard coal and lignite. sampling procedure.

固体矿物燃料.硬煤和褐煤取样方法.取样方法

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hard coal and coke - mechanical sampling - methods of testing for bias

硬煤和焦炭.机械取样.偏差试验方法

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Study on Wear Resistance of Composite Alloy Reinforced with Hard Alloy Grains for Coal Crusher

磨煤机用硬质颗粒增强复合合金材料的耐磨性

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hard coal and coke -- mechanical sampling -- part 1: general introduction

硬煤和焦碳—机械取样—第1部分：一般介绍

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