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. Mehrotra said: "historically, Micron in 3 d XPoint efforts focus on technology development and early stage, but because we are paying more and more attention to high value product solutions, we recently sent a team of product development resources, taking advantage of the opportunity of our eyes." Investment in securities is conducive to adjusting capital investment and improving the efficiency of capital use, thus guiding the rational flow of resources and realizing optimal allocation of resources. So what do you do in the middle of a three hour lesson at four o?clock in the afternoon? What?s the easiest method to settle a hyperactive number of 3rd graders before lunch? Read on to master about four activities which can help to improve teachers? treating classroom time and effort, and help students make the most out of their learning experiences. Now, however, that wisdom is being questioned, not just in Britain. As long as inflation is a real and present danger, it makes sense to put monetary policy down to the conservative central bankers and keep them from the government's fiscal deficit. Instead, the problem today is the opposite: that the central bank cannot raise inflation to its target.