单项选择题
When are fore and aft draft readings required to be entered in the unofficial logbook of a ship? （）
A.Once a day
B.Once a week
C.Prior to getting underway
D.Only when entering waters of different density
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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（）.
A.in the vessel's Official Logbook
B.on the compass deviation card
C.in the compass deviation log
D.on a Napier diagram -
单项选择题
When a vessel is entering or leaving a port，a record of engine speeds is kept in the（）.
A.bell book
B.deck rough log
C.Official Logbook
D.engine rough log -
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? （）
A.Bill of Lading
B.Logbook entry
C.Manifest
D.Shipping document
