it is the first time that 是同位语从句吗？itisthefirsttimethat例句？

it is the first time that 是同位语从句吗？是主语从句，不是同位语从句，itisthefirsttimethat例句？1.It is the first time that the concept of receiver mutual dynamic range is proposed.首次提出了接收机互动态范围的概念。

it is the first time that 是同位语从句吗？

是主语从句，不是同位语从句，例如：

1.It is the first time that the concept of receiver mutual dynamic range is proposed.首次提出了接收机互动态范围的概念。

itisthefirsttimethat例句？

1.It is the first time that the concept of receiver mutual dynamic range is proposed.首次提出了接收机互动态范围的概念。

2.It is the first time that I can sing as very pure and good voice.这是我第一次用这麽美好的声音演唱。