等边三角形绕着它的中心至少旋转( )度后能与自身重合.
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Interest is as ________ to learning as the ability to understand, even more so. [ ]
A. vital
B. available
C. specific
D. similar
某人的红细胞与B型血的血清凝集,而其血清与B型血的红细胞不凝集,此人血型为
A.A型
B.B型
C.O型
D.AB型
E.Rh型