is also known as...中的as是什么词性

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is also known as...中的as是什么词性

as作介词的用法
  as作介词,意思是"作为","以……身份".例如:
  He came to China as a tourist five years
ago.他五年前以游客的身份来过中国.
be known as意为作为……而著名
He is known as a writer.