13. 船舶遇難信號之槍聲或爆炸聲響信號，約每隔幾分鐘鳴放一次？ (A) 1 (B) 2 (C) 3 (D) 4

6. A bearing is taking of an approaching vessel by you and shortly afterwards another observation is made of the same vessel. The bearing is changing slowly. Which of the following circumstances could not be a risk of a collision? (A) When approaching a small vessel. (B) When approaching a very large vessel. (C) When approaching a vessel at close range. (D) When approaching a vessel engaged in towing.

13. 船舶遇難信號之槍聲或爆炸聲響信號，約每隔幾分鐘鳴放一次？
(A) 1
(B) 2
(C) 3
(D) 4

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