单项选择题听力原文:M: May I speak to Tom, please?F: Hold on for a moment, pleasE.What does the woman ask the man to do?A.She asks him to stand up.B.She asks him to sit down.C.She asks him to wait.
单项选择题经济可行性研究的范围包括 ( )A. 资源有效性B. 管理制度C. 效益分析D. 开发风险