智慧职教: ___ coal，the most important natural fuels are gas and oil.

Fossil fuels like coal, oil and natural gas are non-renewable energy sources.

True or False: Of the fossil fuels (coal, oil, and gas), coal deposits will most likely have to be stranded in the highest proportion. A: True B: False

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

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

Which of the following is an example of a positive statement? A: We should cut back on our use of carbon-based fuels such as coal and oil. B: Increasing the minimum wage results in more unemployment. C: Every American should have equal access to health care. D: The Federal Reserve ought to cut the interest rate.

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

People are beginning to use clean energy sources mainly because _______. A: fossil fuels have caused a lot of pollution B: clean energy is cheap C: fossil fuels have cost a lot of lives D: they do not have enough fossil fuels now