thick seam造句怎么写

The application of a high production and efficient mining technology in special thick seam is highly obstructed by those above problems.

The hands of a loving mother line, wandering onto clothing. Departure thick seam, Italy may delay return. Who made the heart-inch grass, reported a three Chunhui.

Shotholes are prepared by powerful drills. The drills may be mounted on mobile platforms, where an unusually thick seam is being worked in two benches; the bulldozer clearing the upper one gives some idea of the height.