是指一个操作项完成后，不再有其他相关联的电气操作。 如拉开、合上一台断路器，投入、退出或切换一块压板等。
REST API的基本形式是可以执行单一操作的URI。
In its basic form, a REST API is a URI that can perform a single operation.
只有在连接器能够将组合查询作为单一操作执行时，才应该应用组合查询。
Combined queries should only apply if your connector can execute the combined query as a single operation.
该选择器的每一位置必须能清晰识别，并且对应于单一操作或控制模式。
Each position of the selector must be clearly identifiable and must correspond to a single operating or control mode.
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