This is one of the means()the electric energy is conducted from one place to another为什么填by which 不填by that

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This is one of the means()the electric energy is conducted from one place to another为什么填by which 不填by that
This is one of the means()the electric energy is conducted from one place to another
为什么填by which 不填by that

This is one of the means()the electric energy is conducted from one place to another为什么填by which 不填by that
关系代词前面有介词时,只能用which,不能用that

这是一个定语从句,one of the means是先行词,the electric energy is conducted from one place to another是从句,你看先行词在从句当中做的是状语成分,通过这种方法,(by与means是固定搭配)which 和 that 叫关系代词.
定语从句当中,关系代词前面有介词,则只能用 prep.+which(表物)或prep...

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这是一个定语从句,one of the means是先行词,the electric energy is conducted from one place to another是从句,你看先行词在从句当中做的是状语成分,通过这种方法,(by与means是固定搭配)which 和 that 叫关系代词.
定语从句当中,关系代词前面有介词,则只能用 prep.+which(表物)或prep+whom(表人) 这是语法.

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好像没by that这种用法，要么就直接添that，不用加by. which表选择。前面有个one of the means，which就是指one of the means的其中一种。从the electric energy is conducted from one place to another就是说明这一种mean.非限定定语从句。好像是这样吧！

that 可有可无，没有确实指代的东西时用，这里有确实指代的东西，用which.
that前一般没有先行词（by）

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