apochromatic lens
医 复消色差透镜… Read the rest
医 复消色差透镜… Read the rest
电 闩锁装置… Read the rest
电 电导调制晶体管… Read the rest
化 平底孔… Read the rest
电 横向修正磁铁… Read the rest
医 腭咽括约肌, … Read the rest
计 选择语句… Read the rest
*[kәn,figju’reiʃәn]
n. … Read the rest