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【多选题】
关于石油和煤说法中不正确的是（ ）A.
石油是液态烃,是纯净物，煤是组成复杂的混合物
B.
煤的气化和液化可制得清洁燃料，减少大气污染
C.
直馏汽油、裂化汽油、合成汽油均是石油产品
D.
用适当的方法使煤气化，可制得甲烷
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A.
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B.
1R, 2S, 3P, 4Q
C.
1Q, 2P, 3S, 4R
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Lower than
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Higher than
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More volatile than
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More stable than
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The same as
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