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单选题
THE MAIN PUMPS NORMALLY USED TO PRESSURIZE THE HYDRAULIC POWER SYSTEMS IN FLIGHT ARE:
A
The 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.
B
The Ram Air Turbine (RAT) for the yellow system， an Engine Driven Pump for the green system and an electric pump for the blue one.
C
The Engine Driven Pumps for green and yellow hydraulic systems and an electric pump for the blue system.
答案解析
正确答案：C
