velocity: n.1.迅速;快速。2.速度,速率。3.周转率。短语和例子at a velocity of 100 miles per hour 用每小时一百英里的速度。 dart off with the velocity of a bird 像鸟一样迅速飞跑过去。 drag-free velocity无阻力飞速,真空飞速。 escape velocity(克服地球引力的)第二宇宙速度,
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On styrene - divinylbenzene copolymeric backbone . it has the advantages of high exchange capacity and rapid exchange velocity and strong mechanic strength 的离子交换树脂,它具有交换容量高,交换速度快,机构强度好等优点。