... drainage layer 排水层 drainage level 排水水准面 drainage modulus 排水模量 ...
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karst drainage base level [地质] 岩溶排水基准面
level drainage 水平排水
level drainage boards 水平排水板
High-level holes gas drainage 高位孔瓦斯抽放
·2,447,543篇论文数据，部分数据来源于NoteExpress
The project is a partnership of the Environment Agency, Huntingdonshire District Council, Middle Level Commissioners, which is a group responsible for land drainage, Natural England and the Wildlife Trust.
BBC: Fry's wetland gift for his mother
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