water well drilling machine的意思|示意
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冲击式打井机
water well drilling machine的网络常见释义
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water well drilling machine相关例句
When large dismeter water well is constructed in cobble and boulder strata drilling by percussion machine is not proper to be used as limited by condition.
卵砾石地层钻进是钻探的难题之一，不仅钻进速度低，钻头的使用寿命短，而且钻探成本高。