In the Northern hemisphere northerly winds may cause temperature（）.

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

Full details of all lights and fog signals are shown on（）.

（）is where the crew eat their meals.

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

Which of the following is not an operation mode of AIS?（）

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

The helm command PORT TWENTY means（）.

Shipboard Emergency Drills must be carried out at least（）on board cargo ship.

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