A tide is called diurnal when（）.

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

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

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

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

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

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

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

（）is where the crew eat their meals.

Which of the following is not a form of precipitation?（）