起动转速取决于发动机的型号、大小和状态以及进入发动机的空气的温度。
The starting speed depends upon the type and size of the engine, its condition and the temperature of the air entering the engine.
发动机在冷起动阶段由于空气温度低、燃油雾化不好、催化剂未能达到起燃温度，因而hc和CO污染严重。
In the cold starting phase, because of the lower air temperature, the worse fuel atomization, and the catalyst temperature being below initiation temperature, HC and co emissions are high.
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