如图所示，在半径为R，质量分布均匀的某星球表面，有一倾角为θ的斜坡．以初速度v₀向斜坡水平抛出一个小球．测得经过时间t，小球垂直落在斜坡上的C点．求：

    Business is the organized approach to providing customers with the goods and services they want. The word business also refers to an organization that provides these goods and services. Most businesses seek to make a profit—that is, they aim to achieve income that is more than the costs of operating the business.____. Commonly called nonprofits，these organizations are primarily nongovernmental service providers. ____

    Business management is a term used to describe the techniques of planning, direction，and control of the operations of a business. ____. One is the establishment of broad basic policies with respect to production; sales; the purchase of equipment, materials and supplies; and accounting. ____. The third relates to the establishment of standards of work in all departments. Direction is concerned primarily with supervision(监管) and guidance by the management in authority.____.

已知抛物线C：y=x²﹣3x+m，直线l：y=kx（k＞0），当k=1时，抛物线C与直线l只有一个公共点．

用性引诱剂诱杀农业害虫是利用（　　）