(来学网)为安全可靠,摄入氮需大于排出氮多少,才能考虑机体处于氮平衡状况?()
  • A.
    (来学网)30%
  • B.
    (来学网)10%
  • C.
    (来学网)8%
  • D.
    (来学网)5%
  • E.
    (来学网)3%