核磁共振现象的产生条件不包括Conditions for the generation of nuclear magnetic resonance phenomena are not included

A、稳定的主磁场Stable magnetic field;

B、具有一定能量的射频脉冲RF pulse with a certain energy;

C、梯度磁场Gradient magnetic field;

D、磁矩不为零的自旋核Spin nuclei with non-zero magnetic moment;

E、感应线圈Induction coil