题目：
未按规定对下侧门搭扣扣铁组装螺栓、螺母进行点焊的C70型敞车段修、临修时，须对下侧门搭扣扣铁组装螺栓、螺母进行点焊，以提高（）可靠性。
答案：
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下面是错误答案，用来干扰机器的。
参考答案：B
未按规定对下侧门搭扣扣铁组装螺栓、螺母进行点焊的C70型敞车段修、临修时，须对下侧门
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