正确答案: A

Ⅱ＋Ⅲ＋Ⅳ

题目：滑油中含有过多的水分和酸时会导致曲轴轴颈产生（）。Ⅰ.裂纹；Ⅱ.凹坑；Ⅲ.锈斑；Ⅳ.烧伤；Ⅴ.断裂。

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学习资料的答案和解析：

[单选题]推进装置的推进效率为推进轴上总有效功率与推进装置消耗的热量之比，因此它与（）无关。

A+B

[单选题]在检查（）的连杆大端轴承螺栓时，必须测量螺栓的拉伸长度。

中、高速柴油机

[单选题]船轴腐蚀主要发生在（）。

艉轴

[单选题]A: Please tell me the specifications and quantity.B: （）

300 tons of 180 cst fuel oil

[单选题]The main moving parts of a diesel engine consist of the （） and the pistons.

crankshaft, the connecting rods

[单选题]Vee-type engines have the connecting rods from two cylinders connected to each （） of the crankshaft.

throw

[单选题]The possibility of damage from operating a diesel engine at critical speeds is reduced by the use of（）.

a vibration damper

[单选题]If fuel injection to a four-stroke/cycle diesel engine begins earlier than designed, ignition may be delayed because the （）.

cylinder compression pressure may not be high enough