【多选题】
A Find out the defects of all the cylinders of the main engine.
B Drain all the cylinders of the main engine.
C Pay close attention to the conditions of all the cylinders of the main engine
D Look at all the cylinders of the main engine.
E 找出主机各气缸的缺陷。
F 把主机的油缸放干。
G 注意观察主机所有缸套的运行状况。
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