repetition survey of existing railway
既有线测量;旧线测量 survey of existing railway 线路复测 repetition survey of existing railway; resurvey of existing railway 测量精度 survey precision; precision of survey ..
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repetition survey of existing railway
现有铁路的重复测量
以上为机器翻译结果,长、整句建议使用 人工翻译 。