胎儿胎盘循环
fetoplacental circulation
胎盘与胎膜
placenta and fetal membranes
锚抓着力与重量比
anchor holding power to weight ratio
胎盘胎膜残留
Retained placental fragment
retained placenta
釉与胎比值
the ratio of glaze to body
称重与重心测量
weight and centroid measurement
价值与重量
goods value and goods weihgt