What is it called when it is possible to ignite the vapour above the oil?（）

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

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

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

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

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

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

The dew point temperature is（）.

The company should establish and maintain procedures to control all documents and date which are relevant to（）.

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