21.  One is to buy a total computer system, which means in the computer company the computer has already been built up.

22.  The software includes system software and applied software.

23.  The last step, which is the most important and difficult step, is to load in software and to test the whole system.

24.  Specialized knowledge is needed to test the addresses of every port of the system, avoiding complicate with each other.

25.  Till now, a whole computer system has been built up.

26.  But you can learn them in a systematic, because they are classify in a certain column and system.

27.  Nowadays the system of allocating jobs has been out of date since the number of applicants greatly outstrips that of the vacancy for jobs.

28.  You May find out the drawback of the system, that was , the graduates always were not assigned the suitable jobs according to their situation.

29.  Because the old system was not effective, many students could not get a job connected with what they learned.

30.  This employment system, that is, graduates choosing work units and work units choosing graduates is called double-choose system.