The mean draft of a ship is the draft（）.

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

Which of the following shall not the officers in charge of the navigational watch do?（）

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

（）is halfway between the forward and after perpendiculars and is reference point for vessel construction.

The loading of the ship must be done in accordance with（）.

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

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（）.

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