半刚性材料
参考答案：
由水泥，石灰，粉煤灰等无机结合料结合而成的水硬性或碎石（砾石）的材料。
In assessing the impact of the loss of a parent through death and divorce it was the distortion of family relationships not the ______ of the bond with the parent in divorce that was vital.
A．disposition
B．distinction
C．distribution
D．disruption
肾盂输尿管连接处梗阻常用的辅助检查有( )
A．肾穿刺活检
B．静脉肾盂造影
C．尿流动力学检查
D．B超
E．消化道造影
