凹向上;上凹的;
the relationship between density and coal rank obtained from the above two methods is alike , and appears concave up curves.
结果发现,两种测定结果随煤化程度的变化关系相一致,都呈一凹面向上的曲线。
瑞鸿网 · 双语新闻
瑞鸿网 · 双语娱乐资讯
瑞鸿网 · 高考英语
瑞鸿网 · 外贸英语