工程实践证明，这些方法成功地解决了上述条件下弱风化硬岩中大口径钻进的难题。
The engineering practice has proved that these methods solved successfully the problem of great caliber drilling in weakly weathered rigid rock by hydraulic piling rig.
工程实践证明，这些方法成功地解决了上述条件下弱风化硬岩中大口径钻进的难题。
The engineering practice has proved that these methods solved successfully the problem of great caliber drilling in weakly weathered rigid rock by hydraulic piling rig.
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