Linux operating system in just a few years has been very rapid development, which Linux has the good characteristics are inseparable. Unix Linux contains all the functions and features. In short, Linux has the following main features: open means that the system follows the world standards, in particular, follow international standards for Open Systems Interconnection. Where in accordance with international standards developed hardware and software, can be compatible with each other, can be easily interconnected. Multi-user refers to the system resources can be different users each have a use, that is, the resources each user has their own specific rights, independently of each other. Linux and Unix has a multi-user features. Multitasking is one of the most important modern computer features. It refers to the computer to run multiple programs simultaneously, and are independent of each program running. Linux system, the process of scheduling each of equal access to the microprocessor. The CPU processing speed is very fast, the result is, start the application appear to run in parallel. In fact, from an application processor performs a set of commands to the Linux scheduler to run the program again between the microprocessor is only a short time delay, the user is feeling out.
Who will carry passengers or cargo exit from the territory belonging to the jurisdiction of the business tax; who will be carrying passengers or goods from outside the territory, not part of the business tax jurisdiction. If a domestic airliner carrying passengers from Japan, the entry is not made levy sales tax revenue, due to the "outside the carriage of passengers." Conversely, a Japanese Airlines plane carrying export goods from China leave the country, the income obtained in China should be taxed, although the company is a foreign entity, it belongs to "carry the goods leave the territory." According to this principle, the transport companies will transport passengers and cargo within China from outside China, or the passenger and freight transported from one place outside another place outside of these two transport operations is not in our territory due to shipment, so I do not pay sales tax. Transportation companies can take full advantage of this provision, conduct business outside of departure, especially in a tax reciprocity agreements with Chinas national passenger and freight transport operations carried out in order to achieve the tax saving purposes.