阿摩線上測驗
8. ______ is a sound signal comprising of seven short and one prolonged blasts and is often given when ships are in distress.
(A) Alarm
(B) Fire alarm
(C) General collision alarm
(D) General emergency alarm
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統計： A(58), B(73), C(54), D(404), E(0) #1764758
統計： A(58), B(73), C(54), D(404), E(0) #1764758
