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- Layers of coal and marble 煤层与大理石层
- This seam of coal reposes on a layer of clay. 这个煤层处于一层黏土岩之上。
- There are vast amount of exploitable gas reserve in the layers of coal. 煤层中还蕴藏着丰富可供开发利用的煤层气。
- Can be used for the carving of granite and marble. 可用于花岗岩,大理石的刻字,雕刻等。
- The floors are of wood, granite and marble. 楼梯用木材、花岗岩以及大理石。
- China has a wealth of coal, iron and other minerals. 中国有丰富的煤、铁和其它矿产资源。
- Belt deviation may cause great abrasion to the sides, and may let the coal fall on the second layer of the belt, so that the stern barrel may draw in coal and pull the belt apart. 皮带跑偏会使侧边磨损加剧，同时会造成煤落入第二层皮带，使尾部滚筒卷煤以致拉断皮带。
- By similarity simulation experiment, we analysis the mining-induced fracture distribution and permeability of coal and rock mass near protective layer mined by speckle method. 阐述了含瓦斯煤的力学特性：通过相似模拟实验，用散斑法对保护层开采过程中来动裂隙分布规律及煤岩体的渗透性进行了分析。
- There are several layers of meaning. 有几层不同的含意。
- The construction of coal and oil transformation project worsened the situation. 特别是煤制油项目的全面上马,水的问题将更为突出。
- The growth of successive layers of a cell wall. 敷着，附着细胞壁连续层的生长
- We need to replenish our stocks of coal. 我们需要再次补充煤的储备。
- Coal and oil are natural products. 煤和石油是天然物产。
- This layer of rock contains a lot of flint. 这一岩层中有大量燧石。
- Prohibition was laid on the export of coal. 禁止煤炭输出。
- Numerical simulation was conducted using UDEC3.0 for the movement of overlaying strata and fracture development caused by the mining of upper protective layers of coal seams with close quarters. 本文利用UDEC3.;0软件对近距离上保护层开采导致的覆岩移动及裂隙发育过程进行数值模拟。
- Wood, coal and oil are different kinds of fuel. 木头、煤炭和石油是不同类型的燃料。
- The inner layer of the wall of a spore. 孢子内壁孢子壁的内层
- Coal geology emphatically studies always stratigraphy and sedimentology of coal and coal-bearing strata. 煤地质学一直偏重于对煤和含煤地层的地层学和沉积学的研究。
- It is extremely important that countries with a shortage of coal and oil find a new source of fuel . 对缺少煤炭、石油的国家来说，寻找新的燃料资源尤为重要。
