【填空题】
70.单翼塞拉门的脚踏动作不良或不动是什么原因？*简答题*___
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答案
(l]下连杆与导筒摩擦力过大。[2]轴承箱内部传动齿轮端部紧固螺栓松动。[3]各连动杆松动脱落。[4]脚踏端部轴承污渍太多，造成转动阻力过大。
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