Aerobic respiration, a process that uses oxygen, and anaerobic respiration, a process that doesn't use oxygen, are two forms of cellular respiration.Although some cells may engage in just one type of respiration, most cells use both types, depending on an organism's needs.erobic respiration, a process that uses oxygen, and anaerobic respiration, a process that doesn't use oxygen, are two forms of cellular respiration.
exists and is an alternate of . conventional machining is that in which the control of removal of material is either by automatic machines or by man handled.while cnc machinig is that in which control of machining process is done by computes or through programming.
Best Answer: CNC stands for Computer Numerical Control and has been around since the early 1970's. Let's look at one piece of manufacturing equipment, a drill press: A drill press can of course be used to machine holes. A person can place a drill in the drill chuck that is secured in the spindle of the drill press.