20. 依國際海上避碰規則第三十四條「運轉與警告信號」「 TWO ， prolonged blasts followed by TWO short blast」表示：
(A) I intend to overtake you on your starboard side.
(B) I intend to overtake you on your port side.
(C) You cannot overtake me.
(D) You can overtake me.

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統計： A(10), B(23), C(2), D(1), E(0) #1235212