Her knuckles whiten as she clenches her hands harder.她的手握得越来越紧，指节都变白了。I must whiten my tennis shoes.我得把我的网球鞋刷白.Use: Used to wash, condense and whiten the pulp.用途: 适应于浆料的洗涤 、 浓缩和漂白....
A large portion of the cytoskeleton consists of threadlike microfilaments composed mainly of the contractile actin.细胞骨架大部分由微丝组成,微丝主要由可收缩的肌动蛋白组成.The eukaryotic cytoskeleton is composed of three basic types of filaments an...
The drawing capstans are of step - cone structure, the surface of which is spray - coated with tungsten carbide.鼓轮采用塔轮式结构, 鼓轮圈表面炭化鸽喷镀.Inclined haul - off capstans of 2500 double haul - off unit ensure the stranded wire r...