(来学网)口腔内的混合唾液中,水约占
  • A.
    (来学网)98.4%
  • B.
    (来学网)99.4%
  • C.
    (来学网)99.8%
  • D.
    (来学网)99.9%
  • E.
    (来学网)99%
正确答案:
B