There are different types of coal.
煤有很多不同类型。
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。
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。
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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