(来学网)醛的通式为
  • A.
    (来学网)R-COOH
  • B.
    (来学网)Ar-COoH
  • C.
    (来学网)R-CHO
  • D.
    (来学网)R-CHO和Ar-COH
  • E.
    (来学网)R-COOH和ArCOOH