模拟固定速度和数字式可变速。
概述电气化铁路用可变速传动技术的变迁。
The changes in variable speed drive technology for electrified railways are summarized.
可变速的水泵:新的可变速的泵在压力鼓系统上面也有改进。
Variable Speed: New variable speed pumps offer a noticeable improvement over accumulator tank systems.
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