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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.
答案解析
正确答案：C
相关知识点：
单向活门功能考点速记
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