relative desity

• 相对密度

relative desity的用法和样例：

例句

1. The analysis indicates that micropacking silica fume works to the density and relative density of RPC, and its pozzolanic effect helps the strength of RPC.
   硅灰的微填充效应有利于提高活性粉末混凝土的密度和相对密度，而火山灰效应有利于提高其强度。