Utilize reoccupying query plan to optimize database performance 利用重用查询计划实现数据库性能的优化
Under instruction of Miyawakis Theory, the vegetation for reoccupying must be mixing vegetation of arbor, shrubbery, and pasture in Northwest China. It is in Shaanxi that the majority area for returning farmland to forestry. 退耕还林还草要乔灌草三结合,用宫胁造林理论指导西北地区林草植被的恢复,还林主要面积在陕西省。