单项选择题
A.1.3g/cm3 B.2.0g/cm3 C.3.0g/cm3
A.1.00g/cm3 B.1.70g/cm3 C.2.70g/cm3
A.40% B.50% C.60%
A.1.5g/cm3 B.2.5g/cm3 C.3.5g/cm3
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