随胎龄增长，肾小体面数密度在下降。肾小体随机断面的平均直径和平均横截面积也略有下降。
The density and average diameter of the renal corpuscle decrease is bound to follow the increase in fetal month.
根据不同流型讨论了等面积圆环法确定断面平均流速时所产生的误差。
The error caused by the ring method of equivalent area to measure the mean velocity of the circular pipe is studied by the different now pattern.
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