（）is on the panel of radar.

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

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

Before any loading takes place any signs of the previous cargo should do（）.

It is dangerous for vessels without the operational radar（）the estuary.

The helm command PORT TWENTY means（）.

Manoeuvring information can not be obtained from（）.

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

Which of the following is not a form of precipitation?（）

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