The determination of diameter and length of tube well filter is always a problem not being completely solved for a long time in tube well engineering from theoretical and practical point of view.
长期以来，管井过滤器直径和长度确定一直是管井工程未完全解决的理论和实践课题，迄今，有关规定不同，存在学术见解分歧，也存在诸多值得讨论的问题。
The determination of diameter and length of tube well filter is always a problem not being completely solved for a long time in tube well engineering from theoretical and practical point of view.
长期以来，管井过滤器直径和长度确定一直是管井工程未完全解决的理论和实践课题，迄今，有关规定不同，存在学术见解分歧，也存在诸多值得讨论的问题。
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