下列（）的情况下增压器转子应进行动平衡试验。Ⅰ.转子变形；Ⅱ.L

【名词&注释】

不合格(unqualified)、充分利用(make full use)、动平衡试验(dynamic balance test)、增压器转子(blower rotor)

[单选题]下列（）的情况下增压器转子^{(blower rotor)}应进行动平衡试验。Ⅰ.转子变形；Ⅱ.L、M间隙不合格；Ⅲ.更换涡轮叶片；Ⅳ.轴承损坏；Ⅴ.压气机导风轮移位。

A. A．Ⅱ＋Ⅳ＋Ⅴ
B. B．Ⅰ＋Ⅱ
C. C．Ⅰ＋Ⅲ＋Ⅳ＋Ⅴ
D. D．Ⅰ＋Ⅱ＋Ⅳ

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学习资料：

[单选题]要充分利用排气余热而降低废气锅炉出口温度t2，同时还应保证锅炉受热面必需的温度，该温差是（）。Ⅰ.排气与给水的温度t2-tw；Ⅱ.排气与蒸汽的温度t2一ts

A. 仅Ⅰ对
B. 仅Ⅱ对
C. Ⅰ或Ⅱ对
D. Ⅰ+Ⅱ

[单选题]The crankcase can not be opened （）the parts have been cooled down.

A. if
B. as
C. unless
D. whe

[单选题]The purpose of the flywheel of a diesel engine is to （）.

A. counterbalance the crank throws on the crankshaft
B. keep the engine running smoothly between power stroke
C. provide a belt-driving surface for the operation of auxiliary machinery
D. prevent the engine from overspeeding

[单选题]Improper maintenance of an automatic auxiliary boiler oil burner could result in （）.

A. fuel pump failure
B. fan motor failure
C. increased feedwater consumption
D. decreased boiler efficiency

[单选题]The crankcases of many diesel engines are kept under a slight vacuum to （）

A. improve fuel economy
B. increase the air charge velocity
C. reduce the risk of explosion
D. all of the above

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