The goaf gas drainage is carried out by drilling holes with strike and middle-high-order at the π type caving coal face in the inflammable and high coal seam.
易发火特厚煤层π放工作面利用走向中高位钻孔实施采空区瓦斯抽放,解决了工作面瓦斯超限制约工作面生产的问题,效果显著,为低瓦斯矿井实现高体积分数瓦斯抽放提供了可行性依据。
It is one of the most common ways to study and illustate seam pattern and its space position that knowing about seam strike and dip angle according to the three*.
根据 3点 (3个钻孔 )的坐标值来确定矿层的走向和倾角 ,是研究并阐明矿层形态及空间位置最常用的方法之一 。
In this paper,the clastic model is used to study the reason of the large determinate error of the horizontal displacement on strike section in mining subsidence By correcting the traditional theoretical model,the new horizontal displacement law on strike section and the conclusion that the influence propagationangle on strike direction is unusually 90°are obtained.
本文利用碎块体力学模型对开采沉陷中走向水平移动预计误差大的原因进行了探讨。
Construction of a society of overall well-being and development trend of Chinese medical and health care;
全面建设小康社会与卫生事业的发展走向
Determination of Highway Arterial Trend in Highway Network Planning Area;
路网规划区公路干线走向确定
Trend of Chinese Agricultural Policy in New Era;
新时期我国农业政策的走向
Chen et al deemed that for an image subblock with a single straight edge, the corresponding DCT (discrete cosine transform) coefficient energy compaction orientation and the spatial edge orientation were perpendicular to each other [2].
证明了含平直单边缘图像子块，其ＤＣＴ变换系数能量并不总是集中分布在与其空间边缘走向垂直的方向上。
Meanwhile, the sufficient and necessary condition for the orientation of an arbitrary simple polygon is given.
同时,给出了任意简单多边形走向的充要条件。
The unbalance financial distribution implies the overall orientation of the governments.
从政府间财政分配关系所反映的政府财力的非均衡性可以看出政府间关系的宏观走向。
Development and Tendency of Quality Breeding under New Situation of Commercial Maize Breeding;
商业化育种新形势下玉米品质育种动态与走向
The Present Situation and the Coming Tendency of Agricultural Economical Structure in 3 Regions of China;
中国三大区域农业经济结构的现状及其未来走向
Development Tendency of Public English Teaching;
公共英语教学走向之我见
The Process, Problems and Trends of Curriculum Reform of Primary School in the People s Republic of China;
新中国小学课程改革：历程、问题及走向
It also analyzes the trends for their running the universities.
本文分析了当代美国研究型大学校长面临的形势,揭示了"伟大校长"难于在当今时代出现的原因,并分析了美国研究型大学校长治校的未来走向。
These factors not only directly influenced the adjustments of Bush s security strategy in his first term, but will also determine to a large extent the trends of the.
这四个关键变量不但直接决定了第一届小布什政府亚太安全战略的调整,而且在很大程度上决定着第二届小布什政府亚太安全战略的走向。