定语从句中from where和 from which怎么区分?

from where应该不是定语从句,是状语从句（除非from是接前面句子的词组）
We have our own office in Shanghai from where we coordinate the production,planning,quality and transport of all our products and moulds.
在上海,我们有自己的办事处,负责与国外沟通产品和模具的生产,计划,质量及运输方面等事宜.from where是地点状语从句
句子拆开,可以扔了状语从句
That is the centre from which you act,think.
你就是从这个中心开始行动和思考的.from which定语从句
把句子拆开来you act and think from the centre有from