double suction
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叶轮有双吸和单吸两种吸液方法。
Impeller has a single suction and double suction two suction fluid ways.
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双吸密封环磨损过多，或叶轮损坏。
Too much wear with dual-suction seal ring or impeller damaged.
双螺杆泵为一种双吸式非密闭的双螺杆泵。
Double screw pump is a kind of double suction not airtight double screw pump.
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