A.乙酸乙酯; B.乙酰胺; C.乙酰氯; D.乙酸酐;
A.①>②>③>④ B.②>①>③>④ C.③>①>②>④ D.③>②>①>④
A.②>①>③>④ B.②>③>④>① C.③>①>②>④ D.①>④>③>②