34. What is the fundamental frequency of the signal of whistle
stipulated 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.
詳解 (共 2 筆)
未解鎖
1. Whistles(a) Frequ...
阿摩線上測驗
登入
