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单选题

THE MAIN PUMPS NORMALLY USED TO PRESSURIZE THE HYDRAULIC POWER SYSTEMS IN FLIGHT ARE:

AThe Power Transfer Unit (PTU) for the green system， an electric pump for the yellow system and a Ram Air Turbine (RAT) for the blue one.

BThe Ram Air Turbine (RAT) for the yellow system， an Engine Driven Pump for the green system and an electric pump for the blue one.

CThe Engine Driven Pumps for green and yellow hydraulic systems and an electric pump for the blue system.

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正确答案：A （备注：此答案有误）

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