Answer:
Diagram of an electric circuit
And Sketch of an HVAC system
Also 3D image of hydraulic piston
Explanation:on.
Electric circuit can be a ladder diagram or set of symbols (motor, switch, relays, solid state logic controllers) showing how they are connected by wires, printed circuit lands etc.
Sketch of an HVAC system can be the electrical connections/wiring used to interconnect the various electronic/electromechanical components.
Also the HVAC schematic can show piping, ductwork in a flow diagram.
Also 3D image of hydraulic piston: pictorial image can also contain schematic views of how the cylinder would be constructed, bevels, etc.