问题:
In a diesel engine, when refitting piston rings you should ()
Ⅰ.check the ring gap at the smallest diameter of the cylinder
Ⅱ. Remove carbon from the ring groove
A . Ⅰ only
B . Ⅱ only
C . both Ⅰ and Ⅱ
D . neither Ⅰ nor Ⅱ
In a diesel engine, when refitting piston rings you should ()
Ⅰ.check the ring gap at the smallest diameter of the cylinder
Ⅱ. Remove carbon from the ring groove
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