The unit head has the advantages of high speed, high rotation accuracy, large bearing capacity and rigidity, as well as reliable and stable operation.
本动力头具有高速、高旋转精度，承载力、刚性大，运转可靠稳定的优点。
Unit head circumference maximum and mean blood flow velocities per minute of fetal middle cerebral artery were changed little during the normal second trimester.
每分钟单位头围大脑中动脉的最大速度及平均速度在中孕期间变化小。
Unit head circumference maximum and mean blood flow velocities per minute of fetal middle cerebral artery were changed little during the normal second trimester.
每分钟单位头围大脑中动脉的最大速度及平均速度在中孕期间变化小。
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