单选题
发布日期:2022-07-20
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相对分子质量(Relative molecular mass),是指化学式中各个原子的相对原子质量(Ar)的总和,用符号Mr表示,单位是1。对于聚合物而言,其相对分子量可达几万甚至几十万;相对分子质量最小的氧化物的化学式为H₂O。
免疫原性是指能引起免疫应答的性能,即抗原能刺激特定的免疫细胞,使免疫细胞活化、 增殖、分化,最终产生免疫效应物质抗体和致敏淋巴细胞的特性。
“大于”可以用数学符号表示为 >,当一个数值比另一个数值大时使用大于号(>)来表示它们之间的关系。其几何意义可以这样解释:对于任意两实数a,b,都可在同一数轴上找到其对应点A,B若点A在点B右侧,则a>b
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Accounting is More Than Numbers Accounting could date back to about 7,000 years ago. People of that time relied on old accounting methods to record the growth of crops and herds. Accounting has greatly developed with the growth of joints tock companies . When you think of accounting, you may find pages of tables and numbers. That image doesn’t usually give you too much excitement. When you have your ownbusiness, though, those numbers come to mean the world to you because they give you the record of how much money you’ve earned or lost. Actually, accounting is not simply about strange dollar amounts or boring numbers; they’re your sales figures, your costs, and your profits. In other words, accounting is alanguage of business. Once you know how to work with those numbers, how to read those numbers and how to read the story they tell, you will be able to manage your business toward greater success. Accounting could date back to about()years ago.
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