There are different types of coal.

煤有很多不同类型。

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There are some types of coal and oil which have very little sulphur in them.

可以使用一些含硫量极少的煤和石油。

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Second this standard applies to determine various types of coal mine major accidents.

第二条本标准适用于判定各类煤矿重大事故隐患。

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Meanwhile, America has recently reversed a steady decline in domestic gas production, thanks to new technology that allows firms to tap previously inaccessible gas trapped in coal, shale and some types of sandstone.

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Some types of partnerships are more prone than others, such as those directly engaged in producing a commodity, like coal.

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There are many types of sulfide minerals, but pyrite and marcasite, the two structural forms of FeS2 that are especially common in coal regions, are the major acid-producers.

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