此外，有部分用户还随意水泵进、出管的管径，这些对扬程也有一定的影响。
In addition, some users can pump into the pipe diameter, which head will have an appreciable effect.
指出主胰管宽径有随年龄增长而增宽的趋势，并在男、女性别间有一定差异性。
The diameter of the main pancreatic duct is increased with the age. There is a significant difference.
对采用负压定径技术生产大管径聚乙烯管的挤出成型工艺及其主要设备进行了研究。
The extrusion molding process and main equipment for producing PE large diameter pipe with negative pressure sizing technology are studied.
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