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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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low discharge pressure and fluid flowC
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考题
单选题When a hydraulic vane pump is working, which of the following is in contact with the vanes?（） (1) the rotor (2) the internal surface of the housing (3) the external surface of the housingA
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(2) onlyC
(1) and (2)D
(1), (2) and (3)
考题
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a clogged pump suction strainerC
a blockage in the line between the pump and hydraulic motorD
the hydraulic motor turning too fast
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