Application of dynamic external fixator in treating distal radial fractures with osteoporosis General specification for electrodynamic loudspeaker of director type 动态外固定架治疗骨质疏松性桡骨远端骨折疗效分析GB/T9397-1996直接辐射式电动锥形扬声器通用规范
But electrodynamic loudspeaker used extensively takes on inductance, and it is a device driven by current, its output sound pressure is proportional to current. 实际中广泛使用的电动式扬声器具有一定的电感,且为电流驱动器件,其输出声压与电流成正比。