that 引导的什么从句
问题描述：
that 引导的什么从句
Some of the bigger firms are engaged in researches which are of such general and fundamental nature that it is a positive advantage to them not to keep them secret
答
不是什么定语从句,这个是个基本的such...that 的用法,
来引导结果状语从句,意为“如此……以致……”
一些较大的公司致力于做这些具有如此普遍和基础意义的研究,以至于不对这些研究保密是有好处的.