When must the Master of a vessel log the position of load line marks in relation to the surface of the water in the Official Logbook?（）

单项选择题When is the density of the water required to be logged in the logbook of a ship?（）

A.Any time the vessel moves from water of one density into waters of a different density
B.Prior to getting underway when the vessel is floating in fresh or brackish water
C.Only when the vessel moves from fresh water into salt water
D.The density of the water is not required to be logged in the unofficial logbook

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

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