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已知A（10.00，20.00）和B（20.00，30.00），则DAB＝（）。

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已知A（10.00，20.00）和B（20.00，30.00），则DAB＝（）。

A.14.14

B.28.28

C.42.42

D.56.56

参考答案:

答案：14.14

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