单项选择题
A.-0.018B.-0.034C.-0.023D.-0.005
A.+0.034B.+0.023C.+0.011D.-0.011
A.-0.009B.+0.009C.+0.018D.-0.018
A.珠光体B.奥氏体C.渗碳体D.铁素体
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