同时可加装速度调控装置，可取代启闭闸阀或蝶阀的大型电动装置。
Meanwhile the devices of speed control can instead the large electric devices of lift gate valves and butterfly valves.
同时可加装速度调控装置，可取代启闭闸阀或蝶阀的大型电动装置。
Meanwhile the devices of speed control can instead the large electric devices of lift gate valves and butterfly valves.
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