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

（）is where the crew eat their meals.

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

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

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

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

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

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

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

Which wind results from a land mass cooling more quickly at night than an adjacent water area?（）