As for a hydraulic single action vane pump, the inner wall of the stator is usually of （） shape.<br>A:circular<br>B:elliptical<br>C:rectangular<br>D:hexagon

As for a hydraulic single action vane pump, the inner wall of the stator is usually of （） shape.
A:circular
B:elliptical
C:rectangular
D:hexagon

出自：海船船员证

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