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Most cast irons have a chemical composition of（）percent carbon.
Most cast irons have a chemical composition of（）percent carbon.
A.0–0.008
B.0.008–2.14
C.2.5–4.0
D.2.5–6.7
正确答案：2.5–4.0
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材料导论
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Cast iron can be classified into four categories: gray cast iron, white cast iron, nodular cast iron and（）cast iron.
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The predominant alloying element in stainless steel is（）, which concentration should be higher than 11 wt%.