The first-order mode and the first eigenfrequency of the pier can be obtained easily and precisely by the impact vibration test method, from which three indexes such as the chang.
利用冲击振动试验法可以准确得到桥墩的一阶振型和一阶频率，利用这两个参数可以构造出一阶振型比、特征参数、一阶曲率模态差三个指标。
The first thing that needs to be done in order to customize a perspective is to enable Design Mode.
自定义透视图所需做的第一件事就是启用设计模式。
Tackle some simple tasks instead of something high-powered; where you've got control over your own schedule, try working a half day or two at first, in order to get back into "work mode".
处理一些简单的任务而不是一些高强度的工作；在你控制你自己的时候，首先工作一个半天或者两个半天，为的是回到”工作的模式“。
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