单向活门是液压或气动部件，允许流体在一个方向上完全流动，但阻止所有反向流

单选题单向活门是液压或气动部件，允许流体在一个方向上完全流动，但阻止所有反向流动。

A、 Check valve, that allows fluid blows in one direction completely but blocks all flow in the other direction, is a pneumatic or hydraulic system component.

B、 Oneway valve is a hydro or gaseous system component that allows fluid flows in one direction freely but blocks all flow in the opposite direction.

C、 Check valve is a hydraulic or pneumatic system component that allows full flow of fluid in one direction but blocks all flow in the opposite direction.

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C、If the aircraft is parked on a slope, make sure that wheel chocks are in position.

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