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2、核磁共振现象的产生条件不包括（） The conditions for the occurrence of NMR phenomena do not include（）
A．稳定的静磁场 Stable static magnetic field
B．具有一定能量的射频脉冲 RF pulse with certain energy
C．梯度磁场 Gradient field
D．磁矩不为零的自旋核 Spin nuclei with nonzero magnetic moment
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B
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