fineness modulus

例句：

1. 1. The fineness modulusof the material is crucial for its strengthand durability.
   材料的细度模量对其强度和耐久性至关重要。
2. 2. The engineerused the fineness modulus to calculatethe stress in the structure.
   工程师使用细度模量来计算结构中的应力。
3. 3. Thefineness modulus of the steel alloy was determined by measuring its density andviscosity.
   通过测量合金的密度和粘度来确定钢的细度模量。