| http://www.w3.org/ns/prov#value | - Early boiler heat calculation computer program are all designed in DOS operating system, and nearly all use the computer language such as BASIC, FORTRAN or C, these language always exist some problem: 1) the interface is not friendly, and people can not understand quickly; 2) the program can not be used in a broad range and it must be corrected when use in another boiler; 3) it is not easy to maintena
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