Unfortunately, Charles ______ yesterday. A: are fired B: fired C: was fired

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

I was to have a trip abroad if ________. A: I had not been fired B: I was not fired C: my boss won't have fired me D: I were not fired

（） heat efficiency in coal-fired power generation is one way to help meet this policy goal.

Which of the following is not a common way for coal caving? ( ) A: Top caving coal in group sequence B: Top caving coal in single cycle sequence C: Top caving coal in multiple cycles in sequence D: Top caving coal in intervals of single cycle

The coal industry is running down as coal is gradually replaced by oil.( industry )

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

5.Whatdoesgetting“fired”meaninthiscontext

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