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【填空题】
15.丙烷瓶与氧气瓶的距离不得小于___。
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B
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16.在钢轨焊接中,含碳量高的钢轨比含碳量低的可焊性___。
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22.超声波探伤仪中,产生时间基线的部分叫做___。
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28.因表面粗糙使超声波束产生的漫射叫做___。
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31.脉冲反射法,不适宜___探伤。
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在线路直线部分,轨距不应小于___。
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《铁路技术管理规程》中规定:水平的允许误差,在维修线路的正线,到发线上,不得大于___。
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