pressed coal
... pressed compact 压坯,压块 pressed coal 构造挤压煤 pressed charge 压制燃料 ...
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火成岩对煤层挤压揉皱形成构造煤，同时构造尖灭端应力集中，提供了足够的瓦斯热力学能。
In the closed seam, the pyrogenic rock compressed and compacted the structure coal. There is a stress concentrated at the tip of the structure, which could provide the inner energy for the gas.
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