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2. Mathematical period: For a function f (x), if there is a non-zero constant T, so that when x takes every value in the domain, there is f (x + T) = f (x), then the function f (x) is called a periodic function. The nonzero constant T is called the period of this function.5.9. 2 Closed craniocerebral trauma with unconscious disturbance was observed on the ground for one to three months, with no clinical symptoms and normal and qualified electroencephalogram.老丁看着杨长帆奔出去，心绪久不能静。In RedHat linux, enabling SYN cookies is accomplished by setting the following command in the startup environment:The first step in classification is to first determine the criteria on which the classification is based, i.e. Dimensions, which can be nationality, zodiac sign, occupation, etc. The essence of dimensions is to find common aspects, for example, everyone has the above 10 dimensions.-According to the "12th Five-Year Plan" for the Construction of National Urban Domestic Waste Harmless Treatment Facilities, it is estimated that by the end of 2015, more than 300 domestic waste incineration power plants will be put into operation and under construction in China.