题目内容

使用盘车从扫气口观察活塞环等零件的工作状态之前，预先必须要做的准备工作包括_____。Ⅰ.合上盘车机；Ⅱ.关闭起动空气；Ⅲ.停止冷却水或冷却油的循环；Ⅳ.手摇气缸油注油器注油；Ⅴ.关闭主起动阀。

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

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