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

Your vessel is docking, but not yet alongside. Which line will be the most useful when maneuvering the vessel alongside the pier?（）.

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

（）is on the panel of radar.

Which of the following shall not the officers in charge of the navigational watch do?（）

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

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

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

（）is where the crew eat their meals.

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