The BEST method of applying foam to a fire is to（）.

Prior to getting underway，the Master or person in charge of a ship must（）.

Shipping society approved buoyant work vests are considered to be items of safety equipment and may be worn by members of the crew（）.

The disadvantage of using CO2 is that the（）.

The brickwork surrounding the firebox of a boiler is known as（）.

Lifesaving regulations require that a fire drill include（）.

The collision bulkhead shall be of（）.

On a ship，a fire drill shall be conducted once every（）.

The discharge from a carbon dioxide fire extinguisher should be directed（）.

The blocking or absence of fire dampers can cause（）.