单项选择题
A.Ⅰ B.Ⅱ C.Ⅲ D.Ⅳ
A.76,91 B.91,76 C.101,91 D.91,91
A.10-15cm B.0.15D-0.25D C.1/3D D.1/2D
A.小于0.95d B.大于0.95d C.小于1.05d
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