The mixture must be of varying degrees of richness to suit engine operating conditions. It must be rich (have a higher percentage of fuel) for starting, acceleration, and high-speed operation.
混合气的浓度比例可以改变，以适应发动机的运行状况。汽车在启动、加速和高速行驶时，需要含燃油浓度较高的混合气；
The automobile engine is usually worked under non steady state of transient operating conditions, i. e. starting, warming, suddenly loading and unloading.
汽车发动机经常在非稳态的过渡工况下工作，即启动、暖机、突加和突减工况。
The automobile engine is usually worked under non steady state of transient operating conditions, i. e. starting, warming, suddenly loading and unloading.
汽车发动机经常在非稳态的过渡工况下工作，即启动、暖机、突加和突减工况。
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