问题
填空题
60kg/m钢轨垂直磨耗超过()时为重伤钢轨。
答案
参考答案:11mm
60kg/m钢轨垂直磨耗超过()时为重伤钢轨。
参考答案:11mm
根据对话内容,从对话后的选项中选出能填入空白处的最佳选项,并在答题卡上将该项涂黑。选项中有两项多余选项。(共5小题;每小题2分,共10分)
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