The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly provided by_______.

A．large conical springs

B．compressed air pressure

C．hydraulic pressure

D．exhaust gas pressure

[主观题]why is quick closing valves important to in engine room machineries ?how are they operated ?

[主观题]C．omputers are __________(wide) used in our daily life.

[单选题]The______is used to measure the volume of a liquid or gas through a pipeline within any given period of timeA．flow-meterB．viscometerC．micrometerD．feeler

[试题](ii) equipment used in the manufacture of Bachas Blue; and (4 marks)

[单选题]F．irewall is a _______ mechanism used by organizations to protect their LANs from the Internet．A．reliableB．stableC．peacefulD．SecurityA．B．C．D．

[单选题]Bridge gauge can be used to measure （） of a diesel engine.A . diameters of journalsB . deflections of crankwebsC . diameters of crankpinsD . none of the above

[单选题]The opening or closing of the cylinder starting valve is controlled by （）.A . the starting air distributorB . the cut-off valve on the air mainC . the main starting valveD . the air bottle control valve

[单选题]The intake valves in a diesel engine are reseated by （）.A . cam followersB . push rodsC . combustion gasesD . valve spring

[单选题]The purpose of the safety relief valves installed on an auxiliary boiler is to （）.A . relieve excess fuel oil pressure during the “off” fire cycleB . admit water to the dry pipeC . throttle the forced draft fan output for proper combustio

[单选题]Temperature control valves installed in the jacket cooling water system of a diesel engine modulates the rate of water flow through the （）.A . cooling water pumpB . nozzle cooling passagesC . cylinder jacketsD . heat exchanger