In order to attain the certain lump coal rate, the key is reasonable picks-lacing.

因而要达到一定的块煤率，关键是截齿的合理排列。

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The coal rate is being increased in recent years owing to the high economics of coal powder injection.

由于高炉喷煤有着显著的经济效益，故近年来煤比正在不断提高。

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It is a kind of feasible research means for optimization of blasting parameters for increasing lump coal rate.

从而为提高煤块率的参数优化提供了一种切实可行的研究方法。

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For two years they've tried to ram through big rate hikes on coal shipments--drawing an antitrust suit by utilities and an investigation by the Justice Department.

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The export coal demand is expected to grow, although at a slower rate, given the tight truckload capacity, growth in international coal prices and improving global demand, particularly from Asian economies.

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It is confined to iron ore and coal, and charges a lower rate than an existing tax on oil and gas.

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