The current GB/T3730.1-2001 car is divided into passenger cars and commercial vehicles. The social profit generated by enterprise activities is the addition of economic profit or the external economic effect of the activity. Companies may make significant monetary profits, but external economic effects often result in negative results, and substantial social profits may be minimal. Such as the industrial revolution, the mass production of the factory is low cost and price of product, but in order to earn maximum profit, factory owners and lower production costs, lead to the low wages of child labor, as well as improper handling industrial waste or contaminants and other social burden. There are 3, 4, 5, 6, 8, 10 and 12 cylinders of the engine. The arrangement of cylinder mainly includes direct column, V shape, W shape, etc. 3. Remove the gasoline pump in the car