In the event of a fire, the doors to a stair tower must be closed to prevent the spread of fire by （）.

A . stop valves B . non-return valves C . quick closing valves D . relief valve

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 . Use the CO system and evacuate the engine room B . Use the fire main system and evacuate the engine room C . Evacuate the engine room and use the CO system D . Evacuate the engine room and use the fire main system

A . secure all openings to the tank B . discharge an initial charge of CO with a hand portable extinguisher C . direct a fire hose into the tank and energize the fire main D . spray the tank boundaries with a fire hose to promote cooling

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

A . Use the C0 system and evacuate the engine room B . Use the fire main system and evacuate the engine room C . Evacuate the engine room and use the C0 system D . Evacuate the engine room and use the fire main system

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 . contaminating food with extinguishing agent B . shutting all sources of air into the compartment C . closing the sea chest D . a grease fire in the ventilation system

A . Switches B . panels C . alarm units D . safety device

A . firing for extended periods in the low fire mode B . overheating, due to waterside deposits C . varying the water level above the crown sheet D . carrying excessive alkalinity in the boiler water

A . Crankshaft revolution B . Type of engine (diesel or gasoline) C . Distance a piston travels during a stroke D . Number of pisto

A . high pressure alarm B . fire alarm C . extinguishers D . fusible plug

A . Use of artificial fertilizer. B . Introduction of new agricultural machinery. C . The'Open-field'system. D . A system of crop rotation.

A . Electricity B . Chain reaction C . Pressure D . Smoke

A . relight the boiler immediately to prevent loss of steam pressure B . relight the fire off the brickwork as the bricks are cherry red C . purge the furnace of any combustible gases before attempting to relight the fire D . speed up the feed pump to prevent dry firing when the burner flame is reestablished

A . contaminating food with extinguishing agent B . spreading through the engineering space C . loss of stability D . a grease fire in the ventilation system

A .  The current connections are rerouted via the backup GSS B .  Secondary GSS cannot be used to configure the GSS cluster C .  All remaining GSSs in the cluster continue responding to any new queries D .  All records in the GSS database are flushed and reconstructed again using a new master GSS

A . progressive downflooding B . reducing the level of drill water from the storage tanks C . causing a list due to the water in the compartment D . reducing the KG to minimum allowable

In four-stroke diesel engine, the cycle of events is completed in () of crankshaft. A.one revolution B.two revolutions C.four revolutions

A．paralyze B．perished C．whirl D．midst

A．distant B．slim C．unlikely D．narrow

A．A.The purchase of equipment . B．B.The investment of additional cash in the business by the owner. C．C.The death of a key manager. D．D.The sale of equipment .