单项选择题 When an azimuth of the Sun has been taken and the deviation of the standard magnetic compass computed，the watch officer should record the results（）.

单项选择题 When a vessel is entering or leaving a port，a record of engine speeds is kept in the（）.

单项选择题 What will be accepted as the shipping papers for an unmanned tank barge but will not be accepted if the tank barge is manned? （）