汽车和拖拉机在熄火前或起动后,驾驶员总要“轰”一阵油门,不仅发动机转速达到很高,而且排气管也会冒出大量的黑烟或蓝烟。“轰车”是驾驶员不自觉地养成的一种不好习惯。他们习以为常地认为这样做可以加快发动机的预热,可以使发动机“透路”有力。还有的驾驶员错误地认为 Before the car and tractor flameout or after starting, the driver always “boom” an accelerator, not only the engine speed reached very high, and the exhaust pipe will emit a large amount of smoke or blue smoke. “Crane car” is a bad habit developed by the driver unconsciously. They are accustomed to think that doing so can speed up the engine warm-up, can make the engine “thoroughfare” powerful. Still others think wrongly