The energy stored in coal ______.
第1题:
Before doing any work on a hydraulic system equipped with accumulators, you should
A.drain the accumulators and purge with oxygen
B.bleed off all stored energy from the accumulators completely
C.charge the accumulators to prevent system energy loss
D.pump the hydraulic fluid into the accumulators to prevent fluid loss
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The former is cheaper and has higher sulfur content than the latter.
The latter is found closer to the surface and contains more sulfur than the former.
The former can help coal-burning power plants meet limits on sulfur dioxide emissions and costs more than the latter.
The latter generates more energy per pound of coal than the former.
The former is found closer to the surface than the latter and helps coal-burnning power plants meet limits on sulfur dioxide emissions.
第12题:
drain the accumulators and purge with oxygen
bleed off all stored energy from the accumulators completely
charge the accumulators to prevent system energy loss
pump the hydraulic fluid into the accumulators to prevent fluid loss
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第22题:
As some countries attempt to shift away from natural gas or petroleum energy systems toward coal-based systems, the need for coal slurry(煤泥) will increase in these countries,()transport mode will be the first choice for transfer this kind of product.
第23题:
borne in mind
taken into account
concerned with
considered
remarked upon
thought of as