Answer: A, B, C.
Answer analysis: The driving methods of the robot mainly include hydraulic drive, pneumatic drive and electric drive.
Hydraulic drive is a common robot drive method, through hydraulic pumps, hydraulic motors and other devices to drive the movement of robot joints. Air pressure drive is also a common robot drive method, through pneumatic components such as air compressors, cylinders, etc. to drive the movement of robot joints. Electric drive is the most common way of robot drive, through motors, reducers and other devices to drive the movement of robot joints.
Hydraulic drives are also used in special applications, such as robots that need to work in water.
So, depending on the title, the answer is ABC.