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

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

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

Despite the rising importance and great convenience of the gyrocompass,the magnetic compass still retain its importance because of its（）.

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

Before any loading takes place any signs of the previous cargo should do（）.

（）is on the panel of radar.

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

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

The ISM code is part of（）.