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

What is it called when it is possible to ignite the vapour above the oil?（）

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

Where would you find information about the time of high tide at a specific location on a particular day of the year?（）

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（）.

According to the relevant regulation, lifeboat should be powered by（）.

A tide is called diurnal when（）.

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

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