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

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

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

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

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

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

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

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

ECDIS must be able to perform all of the following EXCEPT（）.

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