1. Kev tsim kho qhov chaw: Nws yuav tsum tau compacted, tiaj tus, kab rov tav, thiab tshem tawm cov ntse protrusions. 2. Daim phiaj nteg: Ntawm qhov chaw tiaj tus thiab compacted, lub ntsiab quab yuam kev taw qhia (ntev) ntawm daim phiaj teeb tsa yuav tsum yog perpendicular mus rau axis ntawm embankment, thiab nteg yuav tsum tiaj tus, w ...
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