However, a common application design practice is to separate the presentation layer from business logic and encapsulate the business logic in business objects.
然而，常见的应用程序设计是将展示层与商务逻辑分开，并且将商务逻辑封装在商务物件中。
By using dual packer technique, separate-layer fracturing has been run smoothly, with matching instrument, pipe string design, sand...
较好地解决了分层压裂技术，并在工具技术、管柱设计技术、压裂填砂技术、施工技术等方面进行了配套。
By using dual packer technique, separate-layer fracturing has been run smoothly, with matching instrument, pipe string design, sand...
较好地解决了分层压裂技术，并在工具技术、管柱设计技术、压裂填砂技术、施工技术等方面进行了配套。
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