精馏的目的，产品不是混合烃，而是将芳烃分成单体烃。
参考答案：对
Did Tom tell you _____?[ ]
A. when he will leave for Beijing
B. when will he leave for Beijing
C. when would he leave for Beijing
D. when he would leave for Beijing
细胞内钾约占总钾量的98%，血浆中仅占（）
A.1.5%
B.0.3%
C.0.2%
D.2%
E.3%
