题目内容
_____________ are used to provide ___________ (with a certain level of pressure, flow rate and purification) for pneumatic system.
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According to statistics that there are faults of 70%～80% due to the ________________.
A _____________ provides oil to make up for system leakage, allows space for the expansion or contraction of the oil with changes of temperature, enables gas bubbles to rise out of the oil and dirt particles to sink to the bottom, and allows room for heat dissipation or for the inclusion of thermal control devices.
The swash plate axial piston pump changes the flow by changing__________. ()
Piston pump is generally used in _______system. ()
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