输油主泵常要求正的吸入压力，并常由靠近储罐的给油泵(也称喂油泵)提供。
A positive suction pressure on the main pumps usually is needed and is frequently supplied by booster pumps close to the tanks.
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由于该泵进口管径合理，故其必须吸入压力较低。
The full pipe diameter of the pump entrance.
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