fineness ratio

英 美
  • 径长比,细度比
    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。