正确答案: A

Ⅱ＋Ⅳ

题目：轴系校中状态发生变化主要包括轴系中心线的（）发生变化。Ⅰ.直线度；Ⅱ.偏差度；Ⅲ.对中性；Ⅳ.同轴度；Ⅴ.曲折度。

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学习资料的答案和解析：

[单选题]与废气锅炉蒸发量D有正确关系的是（）。

废气锅炉废气进口温度t1越高，蒸发量越大

[单选题]防止增压器振动的措施包括（）。Ⅰ.定期换新轴承；Ⅱ.定期清洗叶片；Ⅲ.定期检查安装间隙；Ⅳ.转子定期检查磨损和变形；Ⅴ.转子定期作动平衡试验。

Ⅰ＋Ⅱ＋Ⅲ＋Ⅳ＋Ⅴ

[单选题]截面螺距是桨叶上（）的算术平均值。

同一截面上局部螺距

[单选题]Engine fuel pump index is （）.

the reading at the rack

[单选题]On a diesel engine, fuel is delivered into the combustion space by （）.

an injection system

[单选题]For a continuous operation diesel engine, a duplex filter unit would be the best arrangement because （）.

changing filter elements would not interrupt engine operation

[单选题]In a normally operating diesel engine, the main cause of lubricating oil contamination in the crankcase is a result of the （）.

breakdown of the lubricating oil by dilutio

[单选题]The opening of an exhaust valve on a modem, large, low-speed, main propulsion diesel engine may be actuated by （）.

hydraulic “push rods”

[单选题]A change in the degree of fuel atomization in a diesel engine would most greatly affect （）.

fuel penetration