(来学网)新鲜唾液的pH范围约为
  • A.
    (来学网)6.0~7.9
  • B.
    (来学网)6.0~6.7
  • C.
    (来学网)4.5~6.0
  • D.
    (来学网)4.5~6.7
  • E.
    (来学网)4.5~7.9
正确答案:
A