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Multipleselectionproblem(singleoption)Fortwolinearinductivelycoupledcoils1and2,whichofthefollowingdescriptioniscorrect?
题型：单选题
选项
A.
A.${M_{{rm{12}}}} = {M_{{rm{21}}}}$
B.
B.${M_{{rm{12}}}}$ is bigger.
C.
C.${M_{{rm{21}}}}$ is bigger.
D.
D.It depends.
正确答案：A