(来学网)正常情况下,食物通过食管需
  • A.
    (来学网)3~5s
  • B.
    (来学网)5~7s
  • C.
    (来学网)7~10s
  • D.
    (来学网)9~12s
  • E.
    (来学网)11~13s
正确答案:
C