未知题型 某铁路客运专线铁路工程，采用CRTS Ⅱ型板式无砟轨道。施工过程中，由于建设单位赶工期，施工单位组织不力，造成部分无砟轨道返工，影响工期1个月，造成直接经济损失为250万元人民币。问题：1．根据《铁路建设工程质量事故调查处理规定》，该事故属于什么等级?假设施工单位负有重要责任，该施工单位应承担多少经济损失?2．客运专线铁路轨道工程的质量管理措施有哪些?3．根据《高速铁路轨道工程施工质量验收标准》的规定，桥上的CRTSⅡ型板式无砟轨道共有几个验收分项?并说明分项名称。

未知题型 听力原文：W: Shall I call you to let you know about the next meeting? It is set for next Tuesday.M: By all means. I don't have a clear picture of what we need to prepare for the meeting.Q: What does the man imply?(15)A．He would prefer calling her next week.B．He will let her decide about the next meeting.C．He would like to buy some refreshments for the meeting.D．He definitely wants to know about the meeting.

未知题型 在等差数列{an}中，a5=3，a6=一2，则a4+a5+…+a10=__________．