单项选择题
A.Al B.SRAL C.ALs D.Als
A.GB B.YB C.Gb
A.<2.5% B.<0.1% C.0.77% D.<2.11%
A.7.80g/cm3 B.7.85g/cm3 C.7.86g/cm3 D.7.95g/cm3
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