The damping ratio is an important characteristic parameter in a second-ordersystem, which has great effect on the dynamic characteristic of the secondordersystem.
阻尼比是二阶系统的一个重要的特征参数，它对二阶系统动态特性有较大的影响。
2
The second number is 0, 1, or 2 and indicates the order in which the file system should be checked upon boot.
第二个数字是0、1或者2，指定了在引导时检查文件系统的次序。
3
The finite time feedback stabilization problem of a class of secondorder nonlinear system is discussed.