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超导体临界磁场H_c(T)随温度变化关系近似为()

超导体临界磁场H_c(T)随温度变化关系近似为()
A.H_c(T)=H_c(0)[1-(T/T_c)^2]
B.H_c(T)=H_c(0)(1-T/T_c)
C.H_c(T)=H_c(0)(T/T_c)^2
D.H_c(T)=H_c(0)T/T_c
正确答案:A