the excavation of protective layer
the excavation of protective layer
开挖保护层
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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In this paper, a new technique of protective layer excavation of horizontal foundation was expounded and applied to the construction of Lijiaxia hydropower station.
本文是水平建基面保护层一次爆破开挖新技术在李家峡水电站工程的应用实例。
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