If you choose to use this code in your own system be sure to check if a location is returned and present an informative error message to the user if a location isn't resolved.
如果您选择在自己的系统中使用该代码，一定要检查是否会返回位置并且如果未对某个位置进行解析时为用户呈现一条告知性的错误消息。
Check the deletion function: Delete something and try to retrieve that information. Make sure proper error message is thrown by the system.
检查删除功能：删除信息，然后检索这条信息，确保系统提示正确的错误消息。
In this system, the variable frequency motor is applied to meet the requirement of low speed to check the compositive error and high speed to measure the vibration.
针对检测综合误差和振动时对主轴转速的要求，采用变频电机来控制主轴转速，以满足系统对转速的要求。
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