normal pin垂直销normaladj.正常的；正规的；精神健全的n.常态；标准normal polarity machining正极性加工normal-plate anemometer垂直叶板风速计normal gastric acid curve正常胃酸曲线normal modes interference简正波干涉normal service conditions标准使用条件normal distribution curve正态分布曲线,常态分布曲线normal sense of the mouth口中和normal error distribution正态误差分布normal velocity component法向速度分量normal probability figure正态概率纸