(来学网)心肺复苏心脏按压时,按压与放松时间之比应为
  • A.
    (来学网)70%:30%
  • B.
    (来学网)60%:40%
  • C.
    (来学网)50%:50%
  • D.
    (来学网)40%:60%
  • E.
    (来学网)30%:70%