You will extinguish a fire when

The class of fire on which a blanketing effect is essential to extinguish the fire is

A.Class 'A'

B.Class 'B'

C.Class 'C'

D.Class 'D'

A fire breaks out in ＃4 hold and partially damages some of the cargo．In order to extinguish the fire the hold is flooded thus damaging the remaining cargo in that hold．Which of the following is (are) correct？ ______ ① The damage to the cargo by fire is particular average． ② The damage to the cargo by water is general average．

A.① only

B.② only

C.Both ① and ②

D.Neither ① nor ②

发生火情时，客人们能用电梯吗?

A.Can guests use the stairs when a fire appears?

B.Can guests use the elevators when a fire presents?

C.Can guests use the lifts when a fire occurs?

D.Can guests use the ladders when a fire breaks up?

How does foam extinguish an oil fire ?______.

A.By cooling the oil below the ignition temperature

B.By removing the fuel souce from the fire

C.By excluding the oxygen from the fire

D.By increasing the weight of the oil

An important step in fighting any electrical fire is to ______.

A.stop ventilation

B.stop the vessel

C.de-energize the circuit

D.apply water to extinguish the fire

One of the disadvantages of using carbon dioxide to extinguish a fire in an enclosed space is

A.the 'snow' which is sometimes discharged along with the gas is toxic

B.prolonged exposure to high concentrations of CO2 gas causes suffocation

C.rapid dissipation of the CO2 vapor

D.the CO2 gas is lighter than air and a large amount is required to extinguish a fire near the deck

A fire starts on your vessel while refueling. You should FIRST ______.

A.stop the ventilation

B.sound the general alarm

C.determine the source of the fire

D.attempt to extinguish the fire

A.broke out

B.put out

C.set out

D.found out

Except in rare cases, it is impossible to extinguish a shipboard fire by ______.

A.removing the heat

B.removing the oxygen

C.removing the fuel

D.interrupting the chain reaction