單項選擇題The diameter of the gravity disc is too big It causes oil to flow through the water outlet We changed the disc and no （） is found in the water outlet.
A.water
B.oil
C.scale
D.ridge
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1.單項選擇題The diameter of the crank-pins should be measured with a （）.
A.salinometer
B.thermometer
C.tachometer
D.micrometer
2.單項選擇題The development of （） has kept pace with the increasing demands made by the steady rise in power produced by modem marine diesels.
A.water
B.fresh air
C.oils
D.gases
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Proper filtering and straining of fuel oil is important because the （）.
題型：單項選擇題
The function of diesel engine piston compression rings is to （）.
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If a diesel engine is difficult to start and operates with the engine temperatures lower than normal, you should suspect that the （）.
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When fuel oil has seriously contaminated a diesel engine lubricating oil, you should （）.
題型：單項選擇題
If the main engine of an unattended engine room shuts down automatically, it will be indicated by an alarm （）.
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