单项选择题
A.0.020g/cm3B.0.030g/cm3C.0.025g/cm3D.0.010g/cm3
A.800-1000gB.1000-1200gC.1000-1500gD.1500-1800g
A.0.1B.0.15C.0.2D.0.25
A.0.1B.0.2C.0.3D.0.4
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