用“shale bed”造句大全,shale bed造句
The fourth oil shale bed developed in lacustrine bog distributes unsteadily with small thickness. It is belong to the oil shale of middle ash and oil yield.
The shale beds in between generally deform plastically.
The fourth oil shale bed developed in lacustrine bog distributes unsteadily with small thickness. It is belong to the oil shale of middle ash and oil yield.
The shale beds in between generally deform plastically.