Ceramic tile: use a small hammer knock on to see if free drum sound, groove seam is full, ceramic tile stick whether level off.
瓷砖：用小锤子敲敲看是否有空鼓的声音，沟缝是否饱满，瓷砖贴的是否平整。
Large mining depth single seam non-full mining, surface structure has only minor extent of damage.
大采深单一煤层的非充分采动，地面建筑物受损程度很小。
Under gassy coal seam condition, the full-heading development is employed. Because of the fast heading a high rate of gas emission arises.
在瓦斯含量较大的煤层采用综掘掘进巷道，由于掘进速度快，出现了瓦斯涌出量过大的现象。
Since 1980's, the full-mechanized caving technology for thick seam in China was rapidly developed with a significant technical and economic benefit.
80年代以来，我国的厚煤层综采放顶煤技术得到长足发展，并已取得显著的技术经济效益。
Since 1980's, the full-mechanized caving technology for thick seam in China was rapidly developed with a significant technical and economic benefit.
80年代以来，我国的厚煤层综采放顶煤技术得到长足发展，并已取得显著的技术经济效益。
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