沟底超挖：开挖矿用电缆沟不得超过沟底标高，如个别地方超挖时，其处理方法应取得设计单位的同意。
Ultra excavation: cable trench excavation shall not exceed the bottom elevation. If ultra-dig in some places, obtain the consent of design units.
某坝顶标高时，最高沉积滩面、库底、正常水位三者以上，最高洪水位以下的空间。
It refers to space during dam crest level; it is above maximum deposited beach face, storage bottom and normal water level as well as under maximum flood level.
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