正确答案: D

Ⅰ＋Ⅱ＋Ⅲ

题目：赛龙是由高性能热固性树脂合成的均质聚合物，具有（）等特点。Ⅰ.弹性好；Ⅱ.耐磨性好；Ⅲ.耐蚀性好；Ⅳ.导热性好；Ⅴ.耐高温。

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学习资料的答案和解析：

[单选题]航行中，柴油机曲轴发生断裂事故，条件许可时可采用（）应急措施进行修理。Ⅰ.金属扣合工艺；Ⅱ.焊接；Ⅲ.局部更新；Ⅳ.铆接；Ⅴ.粘接。

Ⅱ

[单选题]（） of the A-frames there is a strong cast iron frame called the scavenging air box.

At the top

[单选题]The cross-head shoes are white metal lined, grooves being cut horizontally on the face of the white metal to ensure （）.

an adequate supply of lube oil

[单选题]The rate of cylinder lubricating oil metered to each cylinder of a large low-speed main propulsion diesel engine is （）

higher at sea than while maneuvering