题目:
现对一批铁精粉进行-200目粒级测定,已知样品量为500g,测定结果筛上物为50g,试计算该批铁精粉-200目粒级比例。
答案:
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A Great Scientist On October 31st,this year,the worldfamous scientist Qian Xuesen,who is hailed as "the father ...