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单选题
In any right triangle, the acute angles are ______.
A
Equal
B
Adjacent angles
C
Vertical angles
D
Complementary angles
E
Supplementary angles
参考答案
参考解析
解析：
Since the right angle measures 90 degrees, the sum of the two acute angles must be 180-90=90 degrees.
Since the right angle measures 90 degrees, the sum of the two acute angles must be 180-90=90 degrees.
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