正确答案: C

C．Ⅰ＋Ⅲ＋Ⅳ＋Ⅴ

题目：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、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。

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学习资料的答案和解析：

[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

Ⅰ+Ⅱ

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

unless

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

keep the engine running smoothly between power stroke

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

decreased boiler efficiency

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

reduce the risk of explosion