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

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

Which of the following is not an operation mode of AIS?（）

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

The helm command PORT TWENTY means（）.

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

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

A tide is called diurnal when（）.

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

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