教学媒体的共同特性有：固定性、扩散性、重复性、组合性、从属性、能动性和工具性。
参考答案：对
用所给词的适当形式填空。
1. My hobby is reading comic books. What about _____ (you)?
2. Two _____ (five) of the students in our class are League members.
3. I don't think it's always right to be busy _____ (make) money all day.
4. He left home in a hurry because he had some problem _____ (solve) in his office.
5. I don't like travelling by plane. I think it's _____ (safe) to travel by train.
在项目技术分析和评估中，最关键的评估环节是( )。
A．配备一定数量具有一定专业水平的技术专家或技术人员B．评估人员深入实际，调查研究项目的技术与设计方案C．认真核实各项技术方案指标D．搞好方案的定量分析，进行备选方案的综合技术评估
