铁路轨距是钢轨头部踏面下( )mm范围内两股钢轨工作边之间的最小距离。A.16 B 发布时间:2017-06-07 05:35 │ 来源:www.tikuol.com 题型:单项选择题 问题: 铁路轨距是钢轨头部踏面下( )mm范围内两股钢轨工作边之间的最小距离。A.16B.20C.22D.25
题型:单项选择题 All________ to the earthquakehit areas were cut off, which made the rescue much more difficult.[ ]A. approaches B. meansC. plans D. projects 查看答案