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

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

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

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

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

The force resulting from the earth’s rotation that causes winds to deflect to the right in the Northern Hemisphere and to the left in the Southern Hemisphere is called（）.

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

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

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

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