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

【名词&注释】

柴油机增压器(diesel supercharging)、二冲程低速

[单选题]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。

A. A．FR
B. B．e
C. C．e•ω
D. D．G

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学习资料：

[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. 0.003MPa
B. 300mmH，0
C. 3000Pa
D. 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。

A. Ⅱ＋Ⅳ
B. Ⅰ＋Ⅲ
C. Ⅱ＋Ⅲ＋Ⅳ
D. Ⅰ＋Ⅱ＋Ⅲ＋Ⅳ

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

A. When receiving by
B. When received by
C. In order to receiving
D. In order to receive

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

A. reciprocating at the piston pin, rotary at the crank pin
B. reciprocating at the crank pin, rotary at the piston pin
C. straight reciprocation
D. straight rotatio

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

A. increasing the volume of intake air
B. shutting off the fuel supply
C. increasing the engine back pressure
D. over-speeding the engine

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