(来学网)—般人眼的模糊阈值是
  • A.
    (来学网)0.2nm
  • B.
    (来学网)0.2μm
  • C.
    (来学网)0.2mm
  • D.
    (来学网)0.2cm
  • E.
    (来学网)0.2km