定语从句中的关系副词能否用that 替换?

应该是这样的：
1 I know the factory WHERE she works.
变成that就是：I know the factory THAT she works in.(这里的介词 in 不能少.)
2 They are talking about the day WHEN they will go to London.
==They are talking about the day ON WHICH they will go to London.(这里只能用which不能用that,因为有介词在前面.）

不可以。that或which都只能做关系代词，在定语从句里充当主语，宾语或者表语。

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关系副词和介宾结构替换。若定语从句中包含和动词搭配的介词，就可以用that替换