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

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

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

The helm command PORT TWENTY means（）.

Berthing means bringing a vessel to her berth until（）.

The dew point temperature is（）.

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

A tide is called diurnal when（）.

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.