科技图书具有品种多、门类广、内容专、读者面宽窄不一等特点,因而发行量也大小不一,按其发行和销售形势大致可以分为畅销书、常销书和滞销书。那些契合当时热点,或在某一专业领域有独特创新的观点或理论,能解决专业难题并能应用于实践的图书,可能成为畅销书,其特点是发行量大; Books have many varieties, wide range of categories, content, readers vary in width and so on, so the circulation is also different, according to the distribution and sales situation can be divided into the best-selling book, regular book and unsalable books. Books that fit in with hot topics of the day or have unique and innovative ideas or theories in a particular field of expertise that can solve professional problems and can be applied to practice may become bestsellers with a large circulation;