题目：
大型机械车组牵引运行速度有何要求？
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, C解析：工资、薪金所得，对企事业单位的承包经营所得采用超额累进税率。劳务报酬所得、稿酬所得采用的是比例税率，B、C两项符合题意。
大型机械车组牵引运行速度有何要求？
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