在各种衡量集中度的方法中，集中率(Concentration Ration，CR)是最简单易行，使用最广泛的指标，它指贸易规模最大的前几类产品的进(出)口额占整个国家进(出)口额的份...
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The results show that service level has positive and significant influence on firms margin, industry concentration ration hasn't significant influence on margin.
结果表明：单店销售额和零售服务水平对毛利润率的偏效应显著为正，产业集中度对毛利润率的影响不显著。
Prepared with this combination, the enzymic protein expression, enzyme activity and activity ration are significantly higher than other treatments of concentration and time.
此技术组合生产的酶蛋白的表达量、酶活性和比活性，均显著高于其他浓度和时间的处理。
Conclusion: Underway nutritional ration can effectively help increase exercise tolerance, maintain blood sugar level, decrease serum urea concentration, and therefore resist fatigue.
结论：航渡营养口粮能有效地提高小鼠机体运动耐力，维持血糖水平，降低血清尿素氮浓度，抗疲劳。
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