huilding gypsum retarder

• 石膏缓凝剂

huilding gypsum retarder的用法和样例：

例句

1. The effect of bone glue protein retarder on setting time and strength of gypsum is studied.
   研究了骨胶蛋白质石膏缓凝剂对石膏凝结时间和强度的影响。