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A two –phase mixture of ferrite and cementite is
A two –phase mixture of ferrite and cementite is
A.Austenite
B.Martensite
C.Ledeburite
D.Pearlite
正确答案：Pearlite
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材料导论
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With regard to the mechanical properties, metals are typically hard, also relatively stiff and strong when in solid state.
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From the iron-carbon phase diagram, which of the following phases/phase combinations is present for a steel composition of 0.7wt % C at 700°C