4, diving rigs drilling, generally when the completion of a bored pile a motor to check the closed position. Drilling speed should be controlled according to geological changes, to ensure safe operation.
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diving rigs drilling
潜水钻机钻探
以上为机器翻译结果，长、整句建议使用 人工翻译 。
应用推荐
模块上移
模块下移
不移动