采用熔融纺丝，然后经不熔化和高温烧成制得C形碳化硅纤维。制得的SiC纤维异形度为0．3，平均当量直径27μm，平均拉伸强度为1．5GPa。在X波......

目的运用牙体硬组织切片机对牙根连续横断切片观测下颌第二磨牙C形根管的出现率。方法收集离体下颌第二磨牙386颗，自髓室底处开始向......

In order to analysis the distribution characteristics of in-bore magnetic field for C-shaped armature electromagnetic ra......

Ultra wide bands antennas with notched bands characteristics have recently been considered for efficient communication b......