1. 

   aaaabl New Member

   Joined:

   Dec 22, 2010

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   两次，
   一次是九点整，
   一次是三点整，
   其他时刻都不是。

    

   #1 aaaabl, Dec 23, 2010
2. 

   569432802 New Member

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   Dec 12, 2010

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   一天有多少次时针和分针成直角
   支持

    

   #2 569432802, Dec 23, 2010
3. 

   seokai New Member

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   Oct 20, 2010

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   三点，九点。没错。

    

   #3 seokai, Dec 23, 2010
4. 

   小燕子飞 New Member

   Joined:

   Dec 22, 2010

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   平时还真没注意咧

    

   #4 小燕子飞, Dec 23, 2010

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