管数 meaning in English

number of tubes

The capillary vessel number in every unit area increased and the microvascular wall incrassated gradually with aging . the number ratio between capillary vessels and seminiferous tubules were on the trend of increase from 3 weeks to 3 months and decrease from 3 months to 12 months
随着增龄，单位面积内微血管数目逐渐增多；管壁也明显增厚；微血管数与生精小管数的比值从初生后到3月龄逐渐增大，从3月龄到24月龄呈减小的趋势。
Abstract : the maximum tube distribution numbers in tube sheet limited circle for fixed tube sheet heatexchanger have been determinded by used of the superposition method with computer based on c language programming . it is characterized by determination the maximum tube distribution number according to the even number or singular number of center tube distribution . the method is simply and quickly , and can be used for the design and process calculation of heatexchangers
文摘:采用迭加的方法，使用c语言编程在微机上实现管板布管限定圆最大布管数的确定.该方法可根据中心布管数是奇排列还是偶排列来确定最大布管数，简便易行，计算速度快，对换热器的设计及工艺计算具有实用价值