coal dust is explosive.solids lumps of coal are not.a) why is coal dust explosive whereas solids coal is notb)what conditions in a coal mine lead to explosions?c)what safety precautions need to be taken in coal mines to avoid explosions?d)what other

coal dust is explosive.solids lumps of coal are not.a) why is coal dust explosive whereas solids coal is notb)what conditions in a coal mine lead to explosions?c)what safety precautions need to be taken in coal mines to avoid explosions?d)what other She had only some damp wood and coal dust but at last she managed to get the fire (lighting,lit).要讲出缘由！ three tons of coal后面用is 还是are the cover is covered with dust.如题 there is no stone guard coat but dust permitted? 求翻译why we use oil as fuel instead of coal is that it burns better than coal does Dust To Dust 歌词 captive coal coal charcoal Coal Steam RECTANGULAR COAL 查文章的EI检索号文章名字是The Chemisorptions Mechanism Study of Methyl on Different Bonds in Porous Silicon 和 A Comparison Study of Hybrid Flame of Methane/Coal Dust Mixture in Vented Explosions dust是什么意思? dust是什么意思 dust settles Dust to Dust 啥意思? dust in dust 怎么翻译? All we are is dust in the wind 语法是不是有问题?Dust in the wind是我最喜欢的一首英文歌,其中的一句歌词All we are is dust in the wind语法是不是有问题?