(来学网)色觉检查须在充足自然光线下进行,应在适当距离多少时间内读出
  • A.
    (来学网)3s
  • B.
    (来学网)5s
  • C.
    (来学网)10s
  • D.
    (来学网)15s
  • E.
    (来学网)30s