As for a hydraulic vane pump, which of the following is in contact with the vanes during working: （） (1)the rotor (2)the pump shaft (3)the external surface of the housing<br>A:(1) only<br>B:(2) only<br>C:(1) and (2)<br>D:(1),(2)and(3)

As for a hydraulic vane pump, which of the following is in contact with the vanes during working: （） (1)the rotor (2)the pump shaft (3)the external surface of the housing
A:(1) only
B:(2) only
C:(1) and (2)
D:(1),(2)and(3)

出自：海船船员证

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