Which of the following does NOT belong to 'unconventional gas'?
A．natural gas
B．coal-seam gas
C．shale gas
D．tight sands gas

A.natural
B.coal-seam
C.shale
D.tight

【参考答案】

A
本题为细节题。根据第一段“‘unconventionalgas’，atechnicaltermtodesc......

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