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

What is a CORRECT reply to a pilot’s request, How’s your heading?（）

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

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

A tide is called diurnal when（）.

Berthing means bringing a vessel to her berth until（）.

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

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

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

（）is on the panel of radar.