Which of the fire extinguishers listed is to be weighed annually and sent ashore for recharging if the weight loss exceeds 10% of the weight of a full charge?（）

A . Combustion gases flow through the tubes B . Flames impinge on the tubes C . Combustion occurs in the tubes D . Water flows through the tube

A . an increase in the exhaust temperature of the affected cylinder B . the turbocharger may surge C . the explosion pressure in all cylinders will rise violently D . smoke from the turbocharger air inlet filter will be see

A . Carbon dioxide is corrosive when exposed to fire B . Carbon dioxide should be applied slowly to a large engine room fire C . Its total cooling effect is far greater than water D . Its smothering effect is excellent for class B fire

A . Foam B . Solid stream water nozzle C . All-purpose nozzle D . Carbon dioxide

A . acted B . activated C . actioned D . enactioned

A . Classes A and B B . Classes B and C C . Classes C and D D . Classes A and D

A . One man report the fire, and the other two men fight the fire B . One man report the fire, one man fight the fire, and one man evacuate and secure the area C . One man report the fire, one man fight the fire, and one man act as a safety observer D . All three men fight the fire and report it immediately after it is extinguished

A . Check the tag to see when the extinguisher was last charged B . Release a small amount of CO ; if the CO discharges，the extinguisher is acceptable C . Weigh the extinguisher and compare the weight against that stamped on the valve D . Recharge the extinguisher at least once each year

A . An adjacent storeroom，containing spare parts B . A storeroom directly above，containing combustible fluids C . An adjacent storeroom，containing mattresses and linen D . An adjacent storeroom，marked "Stewards Stores&quot

A . More than six short blasts and one long blast on the whistle B . Continuous blast of the ships whistle for a period of not less than 10 seconds supplemented by the same signal on the general alarm C . Three short blasts of the whistle supplemented by the same signal on the general alarm D . More than six short blasts and one long blast on the whistle supplemented by the same signal on the general alarm

A . Dry chemical B . Foam C . Water D . Carbon dioxide

A . Chain reaction B . Thermal action C . Chemical occlusion D . Pyrotechnical reactio

A . Class "A" B . Class "B" C . Class "C" D . Class "D&quot

A . Fuel oil B . Wood C . Celluloid D . Electrical insulatio

A . natural circulation of the water in the water tube boiler is better than that in the fire tube boiler B . for the same output the water tube boiler will carry less mass of water compared with the fire tube boiler C . the water tube boiler will cost shorter time for steam raising D . the water tube boiler require lower skill in operating and maintaining

A . Improper fuel rack positioning B . Lengthy opening of the exhaust valve C . Excessively early injection timing D . Extended light load operatio

A . Acetylene B . Lube oil C . Grease D . All of the above

A . Rose box B . Sea chest or spool piece C . Sluice valve D . Fire pump stuffing box

A . Soda acid B . Carbon dioxide C . Dry chemical D . Cartridge-operated Foam

A . Class "A" and class "B" B . Class "B" and class "C" C . Class "A" and class " C" D . Class "C", class "D", and class "E&quot

A . Conduction of heat to adjacent surfaces B . Direct radiation C . Convection D . All of the above

A . Magnesium B . Paper C . Wood D . Diesel Oil

A . class A B . class B C . class C D . class D

A.CO2 B.ABC dry chemical C.CO2 propelled foam D.All of the above