艉轴铜套的长度一般不超过（）mm，否则应分段制造。

【名词&注释】

磨损率(wear rate)、柴油机(diesel engine)、气缸套(cylinder liner)、中心线(center line)、喷油量(injection quantity)

[单选题]艉轴铜套的长度一般不超过（）mm，否则应分段制造。

A. 500～800
B. 500～1000
C. 600～800
D. 600～1000

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学习资料：

[单选题]柴油机镀铬气缸套正常磨损率应在（）mm/kh范围内。

A. 0.1～0.3
B. 0.05～0.1
C. 0.01～0.03
D. 0.005～0.01

[单选题]曲轴臂距差对应着曲柄的变形，若臂距差大于零，则在垂直平面内曲柄呈()。

A. A．塌腰形
B. B．拱腰形
C. C．左拱形
D. D．右拱形

[单选题]柱塞偶件配合面磨损后会导致（）。Ⅰ.喷油压力下降；Ⅱ.喷油定时延后；Ⅲ.喷油量^{(injection quantity)}减少；Ⅳ.喷油时间延长。

A. A．Ⅰ＋Ⅲ＋Ⅳ
B. B．Ⅰ＋Ⅱ
C. C．Ⅱ＋Ⅲ＋Ⅳ
D. D．I＋Ⅲ

[单选题]柴油机在运行中一旦发生连杆螺栓断裂则可能导致（）损坏。Ⅰ.活塞、连杆；Ⅱ.缸套；Ⅲ.机架；Ⅳ.曲轴。

A. Ⅰ＋Ⅲ＋Ⅳ
B. Ⅰ＋Ⅱ＋Ⅲ＋Ⅳ
C. Ⅰ＋Ⅱ＋Ⅳ
D. Ⅱ＋Ⅲ

[单选题]舵系固定件的中心线与船舶基线垂直，垂直度偏差不大于（）。

A. 0.5mm/m
B. 1.0mm/m
C. 1.5mm/m
D. 2.0mm/m

[单选题]（） the supercharge pressure is, （） power an engine develops.

A. The higher；the more
B. Higher；more
C. Higher；little
D. The higher；the le

[单选题]The process of loop scavenge is that the exhaust will be via ports （） the air ports and controlled by the same piston.

A. behind
B. far from
C. adjacent to
D. in front of

[单选题]The shells are secured by means of bearing caps and studs, the necessary clearance being provided by means of （） of different thickness.

A. shims
B. packing
C. glands
D. washer

[单选题]The rate of heat transfer in a water-tube auxiliary boiler can be increased by （）.

A. operating the boiler at less than normal water level
B. installing fins on the firesides of water-tubes
C. increasing the amount of excess air to the burners
D. treating the boiler water with chemical oxygen scavenger

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