正确答案: C

C．e•ω

题目：对于质量分布不在同一平面内，轴向长度较大的回转件，其平衡程度用（）表示。

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学习资料的答案和解析：

[单选题]废气锅炉的排气流动阻力不能过大，因为二冲程低速柴油机增压器后的排气背压规定一般不宜超过（）。

A，B，C均可

[单选题]主机底脚螺栓松动则可能导致（）。Ⅰ.垫块磨损；Ⅱ.机座局部下沉；Ⅲ.曲轴变形；Ⅳ.主机振动。

Ⅰ＋Ⅱ＋Ⅲ＋Ⅳ

[单选题]（） the cylinder walls, the heat passes through them by conduction.

When received by

[单选题]In diesel engines designed with a crosshead, the motion of the piston rod can be described as （）.

straight reciprocation

[单选题]Electrically operated safety devices on auxiliary diesel engines function to stop the engine by （）.

shutting off the fuel supply