18. 重複呼叫公眾通信之數位選擇呼叫，在多少分鐘內若未收到確認，可在同一數位選擇數位頻道再呼叫？ (A) 5 (B) 4 (C) 3 (D) 2

2. By SMCP, choose one of the following sentences for expressing “Vessel is heeling over to port side; cargo will be put overboard to stop heeling.” (A) “I am pitching over to port; I will jettison cargo to stop pitching.” (B) “I am yawing over to port; I will put cargo over board to stop yawing.” (C) “I have a dangerous list to port; I will jettison cargo to stop listing.” (D) “I have a dangerous rolling to port; I will put cargo over board to stop list.”

18. 重複呼叫公眾通信之數位選擇呼叫，在多少分鐘內若未收到確認，可在同一數位選擇數位頻道再呼叫？
(A) 5
(B) 4
(C) 3
(D) 2

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