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【单选题】
起步发抖的原因是A.
分离轴承套筒与导管油污、尘腻严重，使分离轴承不能回位
B.
从动盘和压盘翘曲变形，飞轮工作端面的端面圆跳动严重
C.
分离轴承缺少润滑剂，造成干磨或轴承损坏
D.
新换的刹车片太从动盘正反装错
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