Objective To observe the occurring time of the primary ossification center of the fetus' cranium viscerale.

目的观察胎儿面颅骨初级骨化中心出现的时间顺序。

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Objective To observe the occurring time of the primary ossification center of the fetus' cranium viscerale.

目的观察胎儿面颅骨初级骨化中心出现的时间顺序。

youdao