Ring groove inserts are occasionally used on aluminum alloy piston to（）<br>A:reduce the ring groove wear rate<br>B:seal against crankcase vapors<br>C:lessen the wear on aluminum part of the cylinder<br>D:allow for the greater expansion rate of aluminum

Ring groove inserts are occasionally used on aluminum alloy piston to（）
A:reduce the ring groove wear rate
B:seal against crankcase vapors
C:lessen the wear on aluminum part of the cylinder
D:allow for the greater expansion rate of aluminum

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