单项选择题
铸钢的密度为（）g/cm3
A.8.6 B.2.7 C.7.8 D.10.6
A.10KN B.5KN C.8KN D.1.9KN
A.4.5% B.4.5‰ C.0.45% D.0.45‰
A.＞0.25% B.＞0.35% C.＞0.45% D.＞0.6%
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