unscreened gravel是什么意思

网络释义

1)unscreened gravel,未筛砾石2)screened fgravel,过筛砾石3)run-of-bank gravel,末筛砾石4)gravel screen,砾石筛5)well-sized gravel,精筛砾石6)gravel sieve analysis,砾石筛析