Precision filter, namely core filter, can further remove the suspended solids and other impurity in the water, it is made of micro hole chinaware, micro hole non-toxin plastic and cell pipe core.
精密过滤器也称保安过滤器，能进一步去除水中悬浮颗粒及其它杂质，它采用微孔陶瓷、微孔无毒塑料、蜂房式管状滤芯。
The riser's inner hollow core (a pipe within a pipe) is reserved for the drill string.
立管内部核心是空心的(管中管)，留给钻柱使用。
The gallop's structure: core pipe, located belt, strain spring. Exc. All the fitting are processed specially.
走马锭的组成部分：内芯管、定位肖、张力弹簧等所有核心配件均经过特殊超精密处理；
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