fineness ratio

• 径长比,细度比

fineness ratio的用法和样例：

例句

1. A paving asphalt penetration ratio improver was introduced.
   介绍了一种提高道路沥青针入度比的改进剂。
2. The isotopic abundance ratio and content are determined with isotopic mass-spectrometry.
   文章用同位素质谱法测定了辐照堆元件铀的同位素丰度比和含量。