单项选择题
A.烷烃 B.芳香烃 C.环烷烃 D.不饱和烃
A.单环 B.二环 C.三环 D.多环
A.烷烃>芳香烃>环烷烃 B.烷烃>环烷烃>芳香烃 C.芳香烃>烷烃>环烷烃 D.芳香烃>环烷烃>烷烃