1) equivalent grade

等效粒级;当量粒度
3) grain size grade

粒度等级
5) equivalent particle density

等效粒子数密度
6) equivalent particle size

当量粒径
1.
Using scour data downstream of the spillway obtained from prototype observation of a completed project, an inverse model test is conducted so as to determine the proper equivalent particle sizes of scour resistance in the model.
应用已建工程的冲刷原型观测资料,进行模型返演试验,确定该工程溢流坝下游岩基的抗冲当量粒径。
补充资料:比等效百万吨数