“Before disconnecting the oil pipe, would you flush the oil

【名词&注释】

预热器(preheater)、不低于(no less than)

[单选题]“Before disconnecting the oil pipe, would you flush the oil retained in the pipe?” asked the oil barge owner （）

A. by using of fresh water
B. with compressed air
C. by using of sea water
D. with chemical compound

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学习资料：

[单选题]废气锅炉废气出口温度不低于155℃，锅炉进口给水循环温度，对有预热器的应高于（）℃，否则凝结的硫酸可使烟灰有粘性，增加烟垢形成的趋势。Ⅰ.120—130；Ⅱ.110—120；Ⅲ.100—110

A. 仅Ⅰ对
B. 仅Ⅱ对
C. 仅Ⅲ对
D. Ⅰ+Ⅱ+Ⅲ

[单选题]针阀体的喷孔磨损后使孔径增大（）时需要换新针阀体。

A. 10%
B. 20%
C. 30%
D. 40%

[单选题]As for a diesel engine, lack of combustion air may be due to （）.

A. fouling turbine
B. fuel pump faults
C. lubrication failure
D. excessive cooling

[单选题]In diesel engines, the four basic events (intake, compression, power and exhaust) are performed once in （）.

A. two crankshaft revolutions in a two-stroke/cycle engine
B. two power strokes in a two-stroke/cycle engine
C. one power stroke in a two-stroke/cycle engine
D. two piston strokes in a two-stroke/cycle engine

[单选题]If an electric cargo winch is being used to lift a draft of cargo and the engine room loses all power，which will occur?（）

A. A pawl，forced by a spring mechanism，will engage the teeth of the bull gear and hold the load
B. An electromagnetic brake will hold the load where it is suspended
C. The load will fall rapidly to the deck unless the foot brake is engaged
D. The load will slowly lower to the deck under control of the drag of the winch motor

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