The main working principle of a jack is to use the pressure generated by a piston under the action of compressed liquid (usually hydraulic oil or air) to lift or push a load-bearing arm to lift the lifted object. The jack can apply force manually or mechanically to complete the lifting task.

Common types of jacks include:

Hydraulic jack: Hydraulic jack uses liquid (hydraulic oil) to transmit pressure in a closed system, and uses operating devices such as handles or pedals to raise the piston to lift the load arm. Hydraulic jacks can provide relatively large lifting force and are relatively easy to operate.

Mechanical jack: A mechanical jack generates lifting force through a screw and gear system. During operation, the handle or handle needs to be turned to rotate the screw to push the piston to lift the load arm. The mechanical jack has a simple structure and does not require a liquid medium, but its lifting force is slightly smaller than that of a hydraulic jack.

Car jack: A car jack is a kind of jack specially used for car maintenance and emergency rescue. It usually uses the hydraulic principle and can quickly lift the car to facilitate tire replacement or chassis repair.

The choice of jack depends on the weight of the object to be lifted, the usage scenario and the ease of operation. When using a jack, pay attention to load limits and safe operating practices to ensure a safe and reliable lifting process.

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