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微粒是注射液中含有的非特意加入的可动而不溶的物质。一般指肉眼见不到、大小在50μm以下的非代谢性小颗粒。当微粒小到12μm时就通不过最小的毛细血管(6～8μm),可被滞留在肺、脑、肝、肾、眼等部
Particulates are non-deliberately added, immiscible substances contained in injection solutions. Generally refers to the naked eye can not see the size of the following non-metabolizable small particles 50μm. When the particles are as small as 12μm pass the smallest capillaries (6 ~ 8μm), can be retained in the lungs, brain, liver, kidney, eye and other ministries