The oscillation property of two dimension impulsive time-delay direct control systems is studied.

讨论二维脉冲时滞直接控制系统的振动性质，给出线性反馈控制下振动与非振动的实例。

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This paper is concerned with oscillation property of solutions of a class of second-order nonlinear differential equation with perturbation.

研究了一类二阶非线性摄动微分方程解的振动性质。

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Strong antidumping property: When titanium is affected by mechanical vibration or electric oscillation, its vibration damping time lasts the longest time, compared to that of steel and copper.

抗阻尼性能强：金属钛受到机械振动、电振动后，与钢、铜金属相比，其自身振动衰减时间最长。

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