The UML specification provides specific text values for diagram types (e.g., sd = Sequence Diagram, activity = Activity Diagram, and use case = Use Case Diagram).
UML规范给图类型提供特定的文本值。 （举例来说，sd代表序列图，activity代表活动图，usecase代表用例图）。
Notice that in Figure 2 the diagram's label begins with the letters "sd," for Sequence Diagram.
注意在图2 中，对于序列图，图的标签由文字“sd”开始。
Used together with SD-LJD (LXK) series ZCT and executing relay to form a complete zero sequence (ground) protection system.
配合SD - LJD (LXK)系类零序电流互感器和动作继电器即组成完整的零序(接地)保护系统。
Used together with SD-LJD (LXK) series ZCT and executing relay to form a complete zero sequence (ground) protection system.
配合SD - LJD (LXK)系类零序电流互感器和动作继电器即组成完整的零序(接地)保护系统。
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