n.納米； n. 十億分之一公尺
Our county is in great need of high-grade white carbon black and nanometre silica products.At present, the products are imported. 我國對高檔白炭黑和納米級二氧化硅產(chǎn)品需求量大，目前主要依靠進口此項目產(chǎn)品。
