which引导的是什么从句

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

你最喜欢生活在哪一个历史时期？

You must signal which way you are going to turn.

你要朝哪个方向转，必须发出信号。

There are two points which I wanted to make.

我想要指出的`有两点。

We are still friends, though, which is good.

不过我们仍然是朋友，这令人感到欣慰。

Which part of Japan do you come from?

你是日本哪个地区的人？

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

资料里有一些需要删除的不适用信息。