(来学网)犬的胎盘类型属于
  • A.
    (来学网)上皮绒毛膜胎盘
  • B.
    (来学网)结缔绒毛膜胎盘
  • C.
    (来学网)内皮绒毛膜胎盘
  • D.
    (来学网)血绒毛膜胎盘
  • E.
    (来学网)绒毛叶胎盘