詹天佑修铁路时,修了居庸关的铁路,是从两边同时向中间凿进,减少时间.可怎么确保准确无误接通呢?知道的好的追加分,加多少分你说.很严谨的,请别乱写.

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/30 06:03:32
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