Of what和of which的区别

of what 后面应该是接名词性从句，of which一般是定语从句，例如：

1、Do you have a mental picture of what it will look like?在你脑子里它会是什么样子

2、I couldn't make head nor tail of what he was saying.我弄不懂他在说些什么。

3、The football supporters began throwing missiles， one of which hit the referee.足球迷们开始扔东西，其中还砸到了裁判一次。

of what 后面应该是接名词性从句，of which一般是定语从句，看前面的句子缺不缺成分，缺主语宾语等成分就用of what，如果前面句子不缺成分，且有先行词，就用of which