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

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

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

Fog is likely to occur when there is little difference between the dew point and the（）.

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

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

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

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

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

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