21. _Preheating the machine is essential. 22. These are converted during kiln feed preheating and become oxidized to form CO and CO 2. 23. I read somewhere that modern cars have complicated computer controlled systems that do not need preheating . 24. This engine provides preheating as well. 25. A preheating region exists prior to the surface of the flame front denoted by ? p. 26. The VCS mode is typically used for weakly exothermic reactions that require preheating prior to ignition. 27. While the waffle iron is preheating , separate the eggs and whisk the yolks into the batter. 28. The Accellis 2X range cooks in half the time of a traditional oven and requires no preheating . 29. Put one on middle shelf of the oven and check that temperature after preheating , she says. 30. Meanwhile, Sir Charles William Siemens had developed his regenerative preheating of fuel and air for combustion.
