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轨道连接螺栓松动，造成轨道位移，也会引起倒塔。
Rail connection bolts loose, resulting in track displacement, will also cause the tower.
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底脚螺栓松动。
Foot stud loose.
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松动油底壳螺栓，拆下每一面的前螺栓。
Loosen oil pan bolts and remove the front bolt at each side.
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螺栓是否松动？
Whether or not loose bolts?
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螺栓是否松动？
Whether or not loose bolts?
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