It was found that the relative hard strata not only formed horizontally but also vertically; and the vertical stratum has a relationship to the hydrodynamics.
研究发现：沿海床剖面不仅存在水平硬层，同时也存在竖直硬层，且竖直硬层与水动力条件有关。
It is con - sidered revolving drilling technique is one of the most effective methods to solve the problem of hard strata drilling in deep well and has good applying prospects.
旋冲钻井技术被认为是解决深井硬地层钻井难题的最有效方法之一，具有良好的应用前景。
The rotary percussion drilling technology have the advantage to raise the hard rock well drilling speed effectively, prevent the borehole deviation in the hard rock or the complicated geologic strata.
旋转冲击钻井技术依靠冲击器产生冲击载荷并作用在钻头上来破碎岩石。该技术能够有效提高硬地层钻井速度，能够防止硬地层及复杂地层钻井中的井斜问题。
Hose bit can be divided into cutter teeth and cone teeth, cone teeth for weathering of soft rock strata, and permafrost, cutter teeth used for drilling hard bedrock.
筒式钻头的切削具可分为截齿和牙轮，截齿筒状钻头用于风化软岩及永冻土地层钻进，牙轮筒式钻头用于硬质基岩钻进。
For soft rock, the hard rock, hard rock and other strata, multi-point drill bit broken efficient.
适用于轻型回转钻机钻进软岩、中硬岩、硬岩等各类地层，钻头采用多点破碎，效率较高。
The hard-and-thick strata ACTS both as the floor of coal seam No. 7 and as the roof of coal seam No. 9 in Zhangshuanglou coal Mine; and coal seam No. 9 is also hard.
张双楼煤矿主采煤层为7煤和9煤，两层煤之间赋存唯一一层厚硬岩层，即9煤层的直接顶也是7煤层的直接底。
The chemical constitution and mineral composition were analysed with a hard kaolin(kaolinite) of the Carboniferous-Permian coal measures strata, in Baishan region of Jilin province as the sample.
以吉林白山地区石炭、二叠煤系高岭土（或高岭石）为试样，进行了矿物成分、含量分析和研磨、 煅烧、添加不同漂白剂加工工艺实验。
The chemical constitution and mineral composition were analysed with a hard kaolin(kaolinite) of the Carboniferous-Permian coal measures strata, in Baishan region of Jilin province as the sample.
以吉林白山地区石炭、二叠煤系高岭土（或高岭石）为试样，进行了矿物成分、含量分析和研磨、 煅烧、添加不同漂白剂加工工艺实验。
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