12.1 Harmful Emissions in Automotive Engine Exhaust 汽车发动机的有害排放物 12.2 Emissions Control Devices in Gasoline Engine 汽油机的排放控制装置 12.3 Other Emissions Control Devices 其他排放物的控制装置 12.4 Emissions Control Devices in Diesel Engine 柴油机的排放控制装置
It should provide drivers with good operating condition and comfort working environment; It should isolate vibration, noise, waste gas and harsh climate and provide passengers with comfort riding environment; It should keep the completeness of cargo and make them easy to load and unload; The structure of body and its equipment should ensure the safety of driving and reduce the influence of an incident. The reasonable outer shape of body can effectively steer the surrounding current and should improve the dynamic characteristics, fuel economy and driving stability. It should also improve the cooling condition of engine and ventilation inside the cab