正确答案: D

Ⅰ，Ⅱ都不对

题目：对传动轴系理解正确的是（）。Ⅰ.长轴系刚性好，对偏差敏感；Ⅱ.短轴系挠性好对偏差不敏感

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学习资料的答案和解析：

[单选题]动力装置长期在部分负荷下工作，废热锅炉排烟温度t2过低，对废热利用设备的维护管理是（）。

不利的

[单选题]由于铁梨木需进口，价格较高，故采用（）作为铁梨木的代用材料。

桦木层压胶木

[单选题]Among the rings of a piston the （） one is subjected to the greatest load and temperature.

top

[单选题]Lubricating oil for an engine is stored at the bottom of the （）, known as the sump or in a drain tank located beneath the engine.

crankcase

[单选题]To avoid scavenge fires occurring the engine timing and equipment maintenance （）.

should be correctly carried out

[单选题]On most diesel engines, the governor controls the output speed by （）.

controlling the amount of fuel injected into the cylinders