A.20% B.40% C.60% D.80%
A.48000 B.48480 C.49200 D.49680
A.與原油同時(shí)開采的天然氣 B.煤礦生產(chǎn)的天然氣 C.開采的天然原油 D.生產(chǎn)的海鹽原鹽