...，向+z轴恢复(t1弛豫)，在某一时点时，特定组织的纵向磁化矢量将恢复至零点(即无净纵向磁化矢量)，若于这一“无效点(null point)”时发射90°rf，则该组织将因无纵向磁化矢量而无信号产生。这种情况发生的条件为：
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Null Point and Gain Adjustable 零点增益可调
optical null point 光学零点
real null point theorem 实零点定理
null point of a polynomial 多项式的零点
electric drift of null point 零点电漂移
precision null-point potentiometry 精密零点电位测定法
A type of capacitive microsensor whose null point and gain can be regulated is introduced here.
文中介绍一种可调零点和增益的电容式微型传感器。
The metaphase plate would thus be the null point between two equal but oppositely directed and acting groups of kinetochore tubules.
中期板大概是两个相等而方向相反的放射状著丝点微管群之间的平衡点。
By means of the null point, growth index analysis and displacement distance plot, the authors discussed the process of negative structure inversion.
采用零点、距离位移曲线和生长指数等定量分析方法，讨论了断裂的构造负反转过程。
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