1. 摩爾斯碼信號「‧─ ─ (點、劃、劃)」，代表何信號？ (A)Whiskey (B)Mike (C) Papa (D) Quebec

17. Your vessel was vibrated heavily at a range of numbers of revolutions of the engines because synchronization occurs between the periods of a vibration of the hull and those caused by the inertia of the reciprocating parts of engines. What do we call this speed? (A)Regulative speed. (B)Critical speed. (C)Calibrating speed. (D)Difficult speed.