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

The company should establish and maintain procedures to control all documents and date which are relevant to（）.

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

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

（）is the act of allocating space to containers on board of a container ship in the order of the discharge ports.

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

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

（）is on the panel of radar.

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（）.

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