The causes producing wall thickness difference in a same pierced shell are expounded and the influences of piercing, rolling and mandrel drawing on the difference are studied.
阐述了穿孔毛管产生同管壁厚差的原因，研究了穿孔和轧管工艺对钢管同管壁厚差的影响。
No significant difference was observed in the thickness of intestinal wall in different Lactobacillus preparation groups (P>0.05);
各乳酸菌制剂对小肠肠壁厚度影响不显著（P>0.05）；
No significant difference was observed in the thickness of intestinal wall in different Lactobacillus preparation groups (P>0.05);
各乳酸菌制剂对小肠肠壁厚度影响不显著（P>0.05）；
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