Manoeuvring information can not be obtained from（）.

The circulation around a low pressure center in the Northern Hemisphere is（）.

The dew point temperature is（）.

Your vessel is docking, but not yet alongside. Which line will be the most useful when maneuvering the vessel alongside the pier?（）.

A tide is called diurnal when（）.

Bales close to the deckhead should be covered to prevent（）.

When the wave period and the apparent rolling period are the same（）.

When steering by autopilot,how often should the steering be checked?（）

How long are you prohibited to consume alcohol prior to serving as a member of a watch?（）

Despite the rising importance and great convenience of the gyrocompass,the magnetic compass still retain its importance because of its（）.