简要叙述收益法的优缺点。
《文学的“根”》一文的作者是（）。
依据国家发展改革委、财政部等9部委发布的《标准施工招标文件》的有关规定，将工程设备费列入材料费；原材料费中的检验试验费列入（） ["措施费","企业管理费","措施项目费","其他项目费"]
一台他励直流电动机拖动恒转矩负载，当电枢电压降低时，电枢电流和转速将（） ["电枢电流减小、转速减小","电枢电流减小、转速不变","电枢电流不变、转速减小","电枢电流不变、转速不变"]
You work as a database administrator for Certkiller .com. Your listener process， L1，is currently listening to three databases：CertK INDB04，Certkiller DB05 and Certkiller DB06. Using Database Configuration Assistant （DBCA） you create one more database，Certkiller DB07，and enable dynamic registration. Which two commands of Listener Control Utility （lsnrct1） would you use to determine whether the dynamic registration occurred for the database， Certkiller DB07， with the L1 listener process？（） ["SHOW L1","SPAWN L1","STATUS L1","SERVICES L1","STATUS LISTENER","SERVICES LISTENER","SHOWcurrent_listener"]
喘振现象的发生应具备哪三个条件？
