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清孔工作是抽水试验前一项必不可少的重要工作。如何把孔隙或溶洞中人为和自然充填的松软物质清除干净,将直接影响抽水试验成果的质量。我队经几年的试验证明,
Clear hole work is an indispensable important work before the pumping test. How to clean pores and karst man-made and naturally filled soft material will directly affect the quality of pumping test results. My team after years of testing proved that,