(来学网)混合唾液中固体物质约占
  • A.
    (来学网)0.20%
  • B.
    (来学网)0.40%
  • C.
    (来学网)0.60%
  • D.
    (来学网)0.80%
  • E.
    (来学网)1%
正确答案:
C