单选题

The primary function of the hydraulic pressure system is to supply pressure for the operation of the flight controls.

A液压系统的主要压力用于飞行控制系统。

B飞行控制运行所需的压力来源于起主要作用的液压系统。

C液压系统的主要功能是为飞行控制系统的操作提供压力。

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正确答案：A （备注：此答案有误）

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