(来学网)气相色谱仪中电子捕获检测器要求用氮气作载气,氮气纯度至少应为多少
  • A.
    (来学网)99.00%
  • B.
    (来学网)99.95%
  • C.
    (来学网)99.98%
  • D.
    (来学网)99.90%
  • E.
    (来学网)99.99%