What should we do now, other than what we have achieved? According to the engine displacement, divided into a miniature (1 liter), light level sedan (1-1.6 liters), intermediate (1.6-2.5 litres), senior sedan (2.5 4 liters), limousine (4 liters). The importance of gasoline was not recognized in the 19th century, when it was used in a great deal of kerosene. The oil refining then relied on simple distillation processes to separate the different components of the oil from the boiling point. The boiling point of the kerosene component is higher, and the use of safety when lighting lamps becomes the main product of crude oil refining, while gasoline and other components are often burned as fuel. By the mid - to late 19th century, the successful use of gasoline engines in 1886, in 1886, the gasoline engine was successfully used as a driving force, thus the importance of gasoline increased. But using distillation, only 20% of the gasoline can be extracted from crude oil. In 1911, the standard oil company have solved the problem of low gasoline yield, by William burton and Robert hamm forest thermal cracking process of the invention, the heavy quality heating gas oil cracking of light gasoline fractions, such as to overall improve the gasoline yield, thermal cracking process in 1913 won the patent license in the United States. The subsequent catalytic cracking process has further improved the gasoline yield and octane value. For a deal that is winning money, it is not as easy to make a deal as it is to make plans to deal with the loss of money. There are many possibilities. Torque is the force that causes the object to rotate. Engine torque refers to the moment when the engine outputs from the crankshaft. It is inversely proportional to the engine speed under the condition of fixed power, and the faster the torque is smaller, the larger it is, which reflects the load capacity of the car in a certain range. Passenger car: in its design and technical features, it is mainly used to carry passengers and their carry-on luggage and (or) temporary items, including the driver's seat, not more than 9 seats. It can also draw a trailer. Classified into ordinary passenger cars, live senior passenger cars, passenger cars, small passenger car, convertible, warehouse back passenger car, station wagon, multipurpose passenger vehicles, short head special passenger cars, cross-country passenger cars and passenger cars, etc. 11 class.