题目内容

Similar to hydraulics, the pneumatic actuators are divided basically into two categories:_ and _.

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____________ actuator has similar construction like a Vane motor with a limited turning angle, rotating angle between 45 and 270 degrees.

A pneumatic system incorporates the following components and devices: (1)___________, (2) _, (3)_, and (4)_________.

___ are used to provide _ (with a certain level of pressure, flow rate and purification) for pneumatic system.

According to statistics that there are faults of 70%～80% due to the ________________.