单选题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 housingA(1) onlyB(2) onlyC(1) and (2)D(1),(2)and(3)
单选题
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)
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