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【单选题】
影响铸铁石墨化的主要因素是铸铁的化学成分,下列哪个元素是促进石墨化的元素。A.
Cr
B.
V
C.
Al
D.
Mn
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A.
正确
B.
错误
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A.
individual
B.
private
C.
single
D.
personal
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