【正文】 A. ing down from the B. D. C B. ing up from the B. D. C C. ing down from the T. D. C D. ing up from the T. D. C Jimei University 0623 The upper end of the cylinder liner forms a_____ of sufficient strength to support it. A. rectangle B. bore C. flange D. coupling Jimei University 0624 The use of a poor quality piston cooling oil can lead to rapid deterioration of its properties with the resultant formation of deposits in the piston crown which in turn results in a considerable_____ in heat transfer. A. advantage B. superior C. increase D. reduction Jimei University 0625 The vessel is out of harbor and in Full Ahead . We are going to run fuel oil instead of _____ and open the fuel oil heater steam valve. A. heavy oil B. lube oil C. fuel oil D. diesel Jimei University 0626 The viscosity regulator controls____ in order to provide oil at the correct viscosity for bustion. A. the engine39。 (3) exhaust。s propeller C. the turning gear D. the thrust beating *0684 When the piston reaches the top of its stroke, the temperature of the air_____ to very high value. A. raises B. rises C. elevates D. arises Jimei University 0685 When the piston reaches the top of its stroke, _____ the pressure_____ the temperature of the air rise to very high value. A. either/or B. neither/nor C. both/and D. from/to 0686 When the piston reaches the top of its stroke, both the_____ and the temperature of the air rise to very high value. A. density B. mass C. pressure D. volume Jimei University *0687 When the rev/min decreases, the governor weights move_____, causing subsequent motions. A. inwards B. outwards C. upwards D. downwards *0688 When the rev/min increases, the governor weights move_____, causing subsequent motions. A. inwards B. outwards C. forwards D. backwards Jimei University *0689 When the starting air valve closes on one cylinder, another starting air valve has_____ opened on another cylinder whose piston has just menced its downward stroke. A. just B. nearly C. merely D. already Jimei University *0690 When the water produced from most evaporator is supplied for drinking purpose, it must be treated to ensure it is biologically pure and_____. A. slightly acidic B. slightly alkaline C. no salty D. slightly bitter Jimei University *0691 When to remove scale from the cooling spaces, acid solution_____ in the system can be tested from time to time by putting some on to a piece of lime石灰 . A. strength 濃度 B. dense C. percentage D. velocity 0692 When turning the engine with turning gear, you should keep the indicator cocks_____. A. attached to the indicators B. opened C. closed D. broken Jimei University 0693 Which cause of the following can lead to the engine not to start on air? A. starting air pressure too high B. correct timing of starting air valves C. three of the starting valves stuck D. the turning gear disengaged *0694 Which factor of the following affects not only the fuel39。s why the fuel oil_____. A. pumped speed/came out B. pumping rate/overflowed C. flowing rate/leaked out D. flowed speed/spilled out Jimei University 0721 You must take good care of the drainage cock of the air control system. Because_____ leads scale formed which might malfunction the pilot control valve and other instruments. A. the temperature B. the rust鐵銹 C. the pressure D. the humidity濕氣 Jimei University 0722 With_____, the corrosion problems are much reduced in a central cooling system. A. no equipment in contact with sea water B. less equipment in contact with fresh water C. more equipment in contact with sea water D. less equipment in contact with sea water Jimei University 0723 In general, the best way for replacement of lamp is_____. A. after the point is reached at which the failures begin to increase rapidly B. before the point is reached at which the failures begin to increase rapidly C. before the point is reached at which the failures begin to increase slowly D. after the point is reached at which the failures begin to increase slowly Jimei University 0724 The troublefree life of an engine indicates_____. A. the period of time during which no trouble occurs to the engine B. no trouble will occur to the engine all its life C. trouble may occur freely to the engine D. no matter what you do to the engine, no trouble will occur during this period Jimei University 0725 When we say that two objects have relative motion, we mean_____. A. the distance between them remains the same B. the distance between them is changing C. the position between them is not changing D. their positions to the earth remain the same Jimei University *0726 Before using or operating any equipment, you should first____ its manual thoroughly and understand its contents____. A. read/sufficient B. consult/sufficiently C. read/sufficiently D. consult/sufficient 0727 The rotating range of the low speed diesel engine is usually lower than_____. A. 100 rpm B. 200 rpm C. 300 rpm D. 500 rpm Jimei University *0728 Among the main propulsion units on board the ship with the same capacity, the lig