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【单选题】
长度相同的两根受扭圆轴，一根为实心轴，一根为空心轴，它们的材料和受力相同，空心轴的内外径之比为0.8。当空心轴与实心轴最大切应力相等时，它们的重量比（空心轴：实心轴）为（ ）
A.
1.2
B.
0.84
C.
1.95
D.
0.51
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