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Multipleselectionproblem(singleoption)Fortwolinearinductivelycoupledcoils1and2,whichofthefollowingdescriptioniscorrect?

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:
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