The application of pipeline inside coating anticorrosion technology to repairing old pipeline system is introduced.
介绍了一种风送涂挤防腐蚀工艺在修复油田老区旧管线中的应用。
The seed has an outer coating that surrounds the genetic material of the new plant, and inside this covering is a concentrated supply of nutrients.
种子有一层外壳,包裹着新植物的遗传物质,外壳内部是集中的营养供应。
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