单项选择题
For a 40wt%Sn – 60wt%Pb alloy at roomtemperature, Calculate the relative amount of each phase present in term of massfraction;
A.Wα=40%;Wβ=60%
B.Wα=60%;Wβ=40%
C.Wα=61.2%;Wβ=38.8%
D.Wα=38.8%;Wβ=61.2%
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单项选择题
晶体中点缺陷的存在,使电阻_____。
A.不变
B.增大
C.减小
D.不能确定
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单项选择题
fcc结构的密排面是_______,密排方向是______,
A.{111},<110>;
B.{111},
B.{110},<110>;
D.{110},<111>;
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