density of packing是什么意思

用法例句

A new type of coarse aggregate interlocking concrete was prepared with a new method called scattering-filling aggregate technology.

采用抛填集料工艺制备了一种粗集料能充分接触并有效嵌锁的混凝土,从而使集料能在混凝土中充分发挥强度骨架的作用。