(来学网)MRI设备的共振频率在连续多次测量中,其变化率不应大于
  • A.
    (来学网)50ppm
  • B.
    (来学网)40ppm
  • C.
    (来学网)30ppm
  • D.
    (来学网)20ppm
  • E.
    (来学网)10ppm
正确答案:
E