已知某水泥中Na(来学网)O含量为0.3%,KO含量为0.4%,则该水泥中碱含量应为(  )。
  • A.
    (来学网)0.3%
  • B.
    (来学网)0.4%
  • C.
    (来学网)0.7%
  • D.
    (来学网)0.56%