胎盘胎膜残留
Retained placental fragment
retained placenta
具有有限记忆的随机分形
Random fractal with finite memory
受压翼缘有效分布宽度系数
effective width coefficient of compressive top flange
稀有-有色金属矿床
rare-nonferrous metal deposits
翼缘有效分布宽度
flange effective distribution width
effective distribution width of flange