正确答案: C

Ⅰ＋Ⅱ＋Ⅲ＋Ⅳ＋Ⅴ

题目：主机主轴承磨损后，（）性能参数发生变化。Ⅰ.臂距差；Ⅱ.桥规值；Ⅲ.轴承间隙；Ⅳ.曲轴轴线状态；Ⅴ.主轴颈下沉量。

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学习资料的答案和解析：

[单选题]（） is sometimes used for piston cooling since leaks into the crankcase would not cause problems.

Lube oil

[单选题]In general, （） is suitable for delivering small quantities at high pressure.

reciprocating pump