on-load tap-changer

例句：

1. 1.The on-load tap-changer is designed to automatically adjust the engine's speed based on the load conditions.
   加载式换挡器设计为根据负载条件自动调整发动机速度。
2. 2. The on-load tap-changer was installed to improve fuel efficiency and reduce emissions.
   安装加载式换挡器是为了提高燃油效率并减少排放。
3. 3. During heavy traffic, the on-load tap-changer can quickly adjust the gear ratio to maintain smooth driving.
   在交通繁忙时，加载式换挡器可以迅速调整齿轮比以保持平稳驾驶。