如图长方体ABCD﹣A′B′C′D′中,AB=6,AD= D′D=5,二面角D′﹣AB﹣D

如图长方体ABCDA′B′C′D′中,AB=6AD= D′D=5,二面角D′ABD

大小是(  )

  A 30°   B 45°   C 60°   D 90°

 

 

 

 

 

 

 

 


答案

B

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