介词 关系代词 能引导非限定性定语从句吗

介词加关系代词能引导非限定性定语从句。
介系词加关系代词引导定语从句的要点如下：
一、介系词后面的关系代词只能用whom或which，而不能用who或that。因为介系词后面一定要用宾格。
二、介系词加关系代词结构中的介系词的选用，或根据上下文要表达的具体意思，或根据先行词的习惯搭配，或根据定语从句中某些字或短语的习惯搭配。有时候，这个介系词可能就是作定语从句谓语的短语动词中的一个固定介系词。
三、介系词加关系代词结构，在定语从句中可以作状语和定语。
四、which和whose在定语从句中，可以作定语，whom则只能作宾语。在介系词from的后面，还可以用关系副词where。如：
如：
He was found disappointed at his failure, because of which he was criticized.
发现他因失败而灰心丧气，他因此受到了批评。
Water boils at 212 degrees Fahrenheit, at which temperature it changes to steam.
水在212华氏度沸腾，在这个温度上就变成了水蒸气。
It was a very agreeable place located within two small hills, in the midst of which flowed a great river.
那个地方位于两座山之间，景色宜人，一条大河穿流而过。
Samuel spent six years in college, during which time he studied economics.
萨缪尔读了六年大学，其间学习经济学。
She came to the city in 1995, in which year there was no college here yet.
她九五年来到了这座城市，那时这里还没有一所大学。
He and his family moved to Italy, from where he went to Switzerland to attend a polytechnic school.
他和他的全家去了意大利，从那儿起他上了瑞士的理工学院。