如果执行单一活动，那么它实际上是指服务操作。
If something performs a single activity, then it really refers to a service operation.
表2：在变化的主动或者波动中设计一个单一的变化所要采取的重要活动
Table 2: Essential activities in planning a single change initiative or wave of change.
这是必须认识到，NPD是一个过程，而不是一个单一的活动。
It is needed to recognise that NPD is a process, not a single activity.
最好，活动板和滑动件也构成单一结构部件。
Advantageously, the mobile plate and the slide also constitute a single structural element.
最好，活动板和滑动件也构成单一结构部件。
Advantageously, the mobile plate and the slide also constitute a single structural element.
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