oil derivatives 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. (2) passenger car: a rectangular carriage, which is mainly used for vehicles carrying personnel (more than 9 persons) and their carry-on items The basic economic unit of society in the primitive society of the clan, tribe, slave owners in the slave society, feudal society's family and the manual workshop, after the evolution of the form of this modern form in a capitalist society was born enterprise. (3) according to the state administration of taxation on implementing the < enterprise accounting system > need clear notice on the problem of income tax (no. 45 (2003) of the state administration of taxation), specified in article 3 of the enterprises have been extracted impairment, price or the assets of the provision for bad debts, if the ready to declare the modulated taxable income, transfer related to the disposal of related assets and written off, should be allowed to make the opposite pay taxes is adjusted. Therefore, the enterprise liquidation or transfer unit (or a subsidiary of independent accounting) all of the equity, be liquidated or transfer of enterprise should according to the past has sterilized and increase taxable income of the provision for bad debts such as the amount of asset impairment provision, the corresponding scale down taxable income, increase the undistributed profit, assignor (or investor) share the right Keynes argued that savings and investment were two interdependent variables, not two independent variables. 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.