若半径不相等的两个圆有公共点,那么这两个圆的公切线最多有(  )。

若半径不相等的两个圆有公共点,那么这两个圆的公切线最多有(  )。

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In the first paragraph, the author makes use of which of the

In the first paragraph, the author makes use of which of the following?

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