• 2022-05-31
    What is NOT a problem when carrying coal? ()
    A: The requirement for through-ventilation
    B: The corrosion some types of coal will cause to the ship
    C: Spontaneous heating
    D: Generation of methane ga
  • A
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      What are the main disadvantages of fully mechanized caving technology? ( ) A: More coal loss B: Fire prone C: Big coal dust D: Gas is easy to accumulate

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      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

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      中国大学MOOC: In England, a dark haired person is asked to enter through the front door at midnight with salt, coal, and bread in his possession. And they believe coal suggests __________ in the new year.

    • 3

      Rail transport uses different types of wagons for different goods, usually are used for move coal and aggregates.

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      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