2. 下圖所示之國際信號旗為何？ (A) C (B) G (C) S (D) X

4. What sound signals should a vessel engaged in fishing, sound in reduced visibility? (A) One prolonged followed by two short blasts at intervals of not more than 2 minutes. (B) One prolonged blast at intervals of not more than 2 minutes. (C) Two prolonged blasts at intervals of not more than 2 minutes. (D) Four short blasts at intervals of not more than 2 minutes.