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well washing
释义
well washing
Encyclopedia
理学
水井钻进作业
释
well washing
洗井
水井打成之后,需替换和清洗井内的泥浆、沉淀物,以及井壁泥皮和含水层孔隙内的堵塞物等,使砾料和靠近砾料含水层中的颗粒重新按其大小自然排列,以形成良好的人工过滤层,水流畅通并达到水清、砂净的作业。
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User requirements
user requirements
user research
users and interactive information retrieval
users authentication authorization
user's collaborative information retrieving behavior
users'cost of fisheries resources
user's diary description
user's exploratory searching behavior
user's perspective study
user's psychology-behavior control mechanism
user stack
user study
user survey method
uses and gratifications approach
U set
U-set
Use the Language of the Motherland Correctly, Fight for the Purity and Health of the Language!(Editorial)
use value
use value of forest resource
use value of resources
U.S.FDA
USFDA
U.S. Federal Aviation Administration
U.S. Food and Drug Administration
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