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

Full details of all lights and fog signals are shown on（）.

Bales close to the deckhead should be covered to prevent（）.

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

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

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

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

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

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

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