The blades at its periphery throw off air centrifugally in a direction following the rotation.轮周叶片将空气沿着转动方向抛离轴心.The defects of alloy steel pipe centrifugally cased are drawn. Their causes and preventives are analysed.归纳出...
The functionalization principle and processing methods of PVC functional materials were introduced.介绍了PVC功能材料的功能化原理和加工方法.Compared to the other functional methods, post - functionalization are more widely researched and a...