1. Two operating characteristics of pulse detonation engine are analyzed: regulation operating frequency characteristics and flow control characteristics. 分析了脉冲爆震发动机的两种调节特性：变频特性和节流特性。
2. There are stable relations between trip mode split and personal characteristics, family characteristics and trip characteristics, which change little with the change of time. 居民出行交通方式选择与个人属性、家庭属性和出行属性之间有较稳定的关系，其随着时间的推移变化甚微。
3. The paper studies conveyer slideway structure dynamic characteristics of a package machine of punch and tunk, and mainly analyses internal characteristics of the slideway. 文中研究了一种瓶盖冲塞机的瓶盖输送滑轨的结构动力特性，着重分析了该轨道的固有特性，其目的是避免系统在工作时发生共振和出现不利的振型。
4. The components and ecological characteristics of pteridophyte were depicted and the characteristics of flora were analyzed as well. 对该区蕨类植物种类与生境特点进行了描述，并分析了其区系特点。
5. The cut-off characteristics, bandwidth characteristics, and characteristic impedance of dominant mode of this pillowy waveguide are analyzed. 分析了枕形波导的截止特性、带宽特性及主模的阻抗特性。
