[环境 矿业]?煤尘
表1作业场所空气中粉尘浓度标准 ? 煤尘(coal dust):作业场所空气中游离二氧化硅含量小于10%的煤尘。
?煤灰
...strous edifices 奇形怪状的高楼大厦 dark, marrow streets 狭窄黑暗的街道 full of petrol fumes 充满了汽油味 coal dust 煤灰 poisonous adj. 有毒的(全部含毒) .
?煤粉尘
煤粉尘
磨煤机
煤球炉
煤尘
Nor could anyone help but notice that the approval came wrapped in coal dust.
FORBES: Magazine Article
At 01:30 on Tuesday a methane and coal dust explosion occurred in the pit's South District.
BBC: Cadeby Main mining disaster marked 100 years on
Miners, their faces still streaked with coal dust, gathered for supper in Charity's cozy kitchen along with the family.
NPR: Beans and Cornbread: Feeding Souls a Mile Deep
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