应用流体机械相似定律及电工学原理，阐明变频调速原理。
The analogical law of fluid machines and principle of electronics are applied to explain the principle of frequency conversion.
应用流体机械相似定律及电工学原理，阐明变频调速原理。
The analogical law of fluid machines and principle of electronics are applied to explain the principle of frequency conversion.
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