In Section Four ,we obtain the new results about the multiplicity of periodic solution for the non-autonomous second order system by using the reduction methods and the critical point theory.
在第四节中，我们使用归约方法与临界点理论得到了关于非自治二阶系统周期解的多解存在性的新的结果。
参考来源 - 非自治二阶系统周期解的存在性与多解性·2,447,543篇论文数据，部分数据来源于NoteExpress
The damping ratio is an important characteristic parameter in a second-order system, which has great effect on the dynamic characteristic of the second order system.
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。
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。
The finite time feedback stabilization problem of a class of second order nonlinear system is discussed.
对一类二阶非线性系统的有限时间状态反馈镇定问题进行了讨论。
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