高碳合金钢细长轴
high-carben alloysteel slender axis
轨道半长轴
semi-major axis of ellipse
后牙长轴
posterior tooth long axile
计算器长轴电位器
long computer potentiometer
井下长轴传动泵
borehole shaft driven pump
临床冠长轴
Facial axis of the clinical crown
万能长轴车床
long spindle universal lathe