单项选择题
A.冷却缸筒 B.冷却活塞 C.润滑活塞环 D.冲洗活塞销
A.0.35 B.0.12 C.0.16 D.0.2
A.0.9-1.1 B.0.96-1.06 C.0.9-1.2 D.0.88-0.92
A.1% B.0.5% C.0.2% D.3%
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