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【单选题】
关于回火索氏体和索氏体的比较错误的是（ ）。A.
回火索氏体的强度、塑性和韧性均好于索氏体
B.
回火索氏体中的渗碳体为片状，而索氏体中的渗碳体为粒状
C.
回火索氏体是调质处理的结果
D.
索氏体是正火处理的结果
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