( ) is not a real coal, but only a precursor. A: Anthracite B: Bituminous coal C: Lignite D: Peat

For light traffic, which of the following is not used A: Sand clay. B: Macadam. C: Brick. D: Bituminous mixtur

For light traffic, which of the following is not used A: Sand clay. B: Macadam. C: Brick. D: Bituminous mixture.

The most easily oxidized coal is (). A: lignite coal B: bituminous coal C: lean coal D: anthracite coal

The dry ash free volatile content of a coal is 7%, which is most likely to belong to (). A: Bituminous coal B: Anthracite C: Lignite D: Lean coal

The dry ash free volatile content of a coal is 47%, which is most likely to belong to (). A: Lignite B: Lean coal C: Anthracite D: Bituminous coal