27. 「摩爾斯碼信號」中，「‧─ ─ (點、劃、劃)」代表何字母信號？ (A) W (B) M (C) P (D) Q

31. “Running Fix” position was obtained by: (A) two lines of position that are obtained at same time (B) two lines of position that are obtained at different time (C) one line of position and one estimate position at the same time (D) one line of position and one assume position (AP) at the same time