石油、牛油 、甘油虽然都称作油,但从化学组成和分子结构看,它们是

石油、牛油 、甘油虽然都称作油,但从化学组成和分子结构看,它们是完全不同的。下列说法正确的是

A.牛油属高分子化合物,甘油属小分子化合物    B.牛油属酯类,甘油属醇类

C.石油是混合物,牛油、 甘油是纯净物        D.三种油都属油脂

答案

B

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