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

In the Northern hemisphere northerly winds may cause temperature（）.

A tide is called diurnal when（）.

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

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

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

Manoeuvring information can not be obtained from（）.

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

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

（）is where the crew eat their meals.