| 释义 |
DEFINITIVE EXAMPLES 权威例句〔PET scanner〕A device that produces cross-sectional x-rays of metabolic processes by means of positron emission tomography.正电子发射层析扫描仪：一种装置，通过正电子放射的X射线断层照相术产生的模截面X射线的代谢过程美国传统〔PET scan〕A cross-sectional image produced by a PET scanner.正电子发射层析扫描图：由正电子发射层析扫描仪所绘制的模截面图美国传统〔current density〕Symbol j, J Electricity The ratio of the magnitude of current flowing in a conductor to the cross-sectional area perpendicular to the current flow.符号 j, J 【电学】 电流密度：在某一导体中流动的电流量与电流方向垂直的截面面积之间的比率美国传统 |