(来学网)两人轻声谈话的声强级为40dB,热闹市场上噪声的声强级为80dB。市场上噪声的声强与轻声谈话的声强之比为:
  • A.
    (来学网)2
  • B.
    (来学网)20
  • C.
    (来学网)102
  • D.
    (来学网)104