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

Where would you find information about the time of high tide at a specific location on a particular day of the year?（）

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

A tide is called diurnal when（）.

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

The ISM code is part of（）.

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

The force resulting from the earth’s rotation that causes winds to deflect to the right in the Northern Hemisphere and to the left in the Southern Hemisphere is called（）.

The helm command PORT TWENTY means（）.

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