（） are formed by abrasive particles entering the bearing a

【名词&注释】

动力装置(power plant)、燃油消耗量(fuel consumption)

[单选题]（） are formed by abrasive particles entering the bearing and scoring the shaft.

A. Grooves
B. Recesses
C. Ridges
D. Ni

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学习资料：

[单选题]每海里燃油消耗量是指船舶每航行1nmile动力装置所消耗的燃油总量，它考虑了（）.Ⅰ.动力装置本身的性能；Ⅱ.船舶的航行性能

A. 仅Ⅰ对
B. 仅Ⅱ对
C. Ⅰ，Ⅱ都对
D. Ⅰ，Ⅱ都不对

[单选题]舵杆上（）的纵向裂纹可焊补修理。

A. 长度＜1/4公称直径、深度＜10%公称直径
B. 长度＜1/5公称直径、深度＜10%公称直径
C. 数量不超过2条且不在同一条直线上
D. 数量不超过4条

[单选题]Valve gear knocks are more easily located while the engine （）.

A. is running
B. stops
C. is repaired
D. lacks of oil

[单选题]With respect to the flow of lubricating oil through a diesel engine, the lube oil coolers are located after filters in order to （）.

A. allow filtration of less viscous oil
B. decrease the pressure drop across the filter
C. improve overall filtration
D. all of the above

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