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【单选题】
某发动机在稳定运转时不响,转速突然变化时发出低沉连续的“哐哐”声,转速越高,声响越大,有负荷时,声响明显,则此声响为()A.
曲轴主轴承响
B.
连杆轴承响
C.
活塞敲缸
D.
活塞销响
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