h5n7
瓜绢野螟
pgm_430mei
茶油精
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拖鞋生产设备The Development and Application of Underground Coal Gasification Ma Xiao-fei, Wang Yong-bing (Xinjiang Special Equipment Inspection and Research Institute, Urumqi 830013) Abstract: The reserve volume of deep coal seams is huge, but the development and application is affected by some factors, such as the high water pressure, the high crustal stress, the high gas and the high earth temperature. Therefore, the research and experiment of efficient coal technologies is irreplaceable
挡板砖
