单项选择题The research and development (R & D) function of a business: (i) Is primarily concerned with market research (ii) Can improve existing products as well as developing completely new products (iii) Has been less important for firms manufacturing computers to meet an industry standard than for those firms developing the next generation of computers (iv) Is always undertaken under contract by specialist external consultancies Which of the above statements are correct
单项选择题《一种微生物制备玉米秸秆多孔活性炭材料的方法》,这个专利是发明专利。( )