The number of pit selection areas 6, 8, 9 and piles is optimal. Guests like to choose these lucky numbers. If friends go together, they will choose technicians with these lucky numbers to save face. Businessmen are superstitious. Generally, technicians are numbered, and each number corresponds to one person, which is convenient for management and statistics.

The job number system is mainly suitable for large enterprises with tens of thousands of employees, mainly used for archives and electronic management. First: one person, one number, is as unique as an ID card. Even if the employee leaves, this job number can no longer be used. Second, the internal work number of the enterprise has the effect of identity, and issuing and wearing the work number can distinguish whether it is an enterprise employee or not, which is convenient for safe work. Third: enterprises can handle top-up payment, salary reward and so on. Employment number, because there are many people with the same name and surname, the employment number is convenient and quick, and there will be no mistakes. Fourth, it is convenient for employees to use, and they don't need to carry and show their ID cards frequently. They just need to show their work tags or job numbers to protect employees' privacy. Fifth, electronic management; It is time-saving and labor-saving for enterprises to find employee files and enter job numbers. It is convenient and quick for employees to enter job numbers, log on to the enterprise website to inquire about wages or make suggestions.