由于锚固体系中有不同大小和程度的缺陷，声波在传播过程中将产生能量衰减、相位突变及频散现象。
The existence of various lacunas in bolt bonding system will cause the acoustic wave energy attenuation, phase aberration and frequency dispersion.
固体中空洞在缺陷位置成核。
在挤出过程中，以熔体破裂形式出现的挤出物的缺陷只有在PP熔体处于半固体状态时才能观察到。
The defect of extrudate in the extrusion process in the form of melt fracture could only be evidenced in the semisolid state of PP melt.
应用推荐