Field tests indicate that the auger-type under-reaming tools can be used in construction of under-reamed piles in various formations.
试验表明，该种钻具可以满足在各类地层中的施工要求。
Field tests indicate that the auger-type under-reaming tools can be used in construction of under-reamed piles in various formations.
试验表明，该种钻具可以满足在各类地层中的施工要求。
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