超离心分析测得相对分子质量为280 000。
The molecular weight was determined to be 280 000 by ultracentrifugation.
采用扁平式超细气流粉碎机与超细离心式空气分级机组成的闭路系统对白云石进行超细加工，分析了操作参数对产品粒径的影响。
Ultrafine dolomite powders was prepared with ultrafine pancake air jet mill and ultrafine classification system. The relations among operation factors were analyzed.
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