which引導的是什麼從句

Which period of history would you most like to have lived in?

你最喜歡生活在哪一個歷史時期？

You must signal which way you are going to turn.

你要朝哪個方向轉，必須發出信號。

There are two points which I wanted to make.

我想要指出的`有兩點。

We are still friends, though, which is good.

不過我們仍然是朋友，這令人感到欣慰。

Which part of Japan do you come from?

你是日本哪個地區的人？

There is some noise in the data which needs to be reduced.

資料裏有一些需要刪除的不適用信息。