短語詞組短語underground coal gasification station 煤炭地下氣化站underground coal gasification ucg 煤炭地下氣化underground coal gasification process 煤炭地下氣化過程Underground coal gasification plant 地下煤氣化廠underground gasification of coal 煤的地下氣化coal underground gasification 煤炭地下氣化underground E gasification of coal 煤炭地下氣化coal gasification underground 煤地下氣化coal bed underground gasification 煤田煤層地下氣化 返回 underground coal gasification