関連ワード:  write function of computer system    write function unit of computer system input process output    write the functions of operating system in computer    write any two function of computer system    write function of control unit in computer system    write any three uses of computer system    write down the function components of computer system    write any two function of the computer system class 2    write the function of an icon in computer system    write the function of control unit in computer system class 6