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.

【名词&注释】

耐高温(high temperature resistance)、导热性(thermal conductivity)、高性能(high performance)、热固性树脂(thermosetting resin)、耐磨性好(good wear resistance)

[单选题]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^{(good wear resistance)}；Ⅲ.耐蚀性好；Ⅳ.导热性好；Ⅴ.耐高温。

A. Ⅱ＋Ⅲ
B. Ⅰ＋Ⅱ＋Ⅳ＋Ⅴ
C. Ⅲ＋Ⅳ＋Ⅴ
D. Ⅰ＋Ⅱ＋Ⅲ

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学习资料：

[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。

A. Ⅱ
B. Ⅱ＋Ⅳ
C. Ⅲ＋Ⅳ
D. Ⅰ＋Ⅴ

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

A. At the top
B. At the bottom
C. In the top
D. In the bottom

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

A. an adequate supply of lube oil
B. an adequate supply of fuel oil
C. an adequate supply of turbine oil
D. an adequate supply of cylinder oil

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

A. the same, whether at sea, or during maneuvering
B. adjusted during each hour of operation while at constant RPM
C. higher at sea than while maneuvering
D. lower at sea than while maneuvering

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