問題詳情

34. What is the fundamental frequency of the signal of whistlestipulated by COLREGS?
(A) Within the range 50~500 Hz.
(B) Within the range 60~600 Hz.
(C) Within the range 70~700 Hz.
(D) Within the range 80~800 Hz.

參考答案

答案:C
難度:困難0.238095
統計:A(3),B(6),C(5),D(4),E(0)

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