Outdoor dust exhaust pipe, if it is beyond the height of the building, should also consider the use of lightning protection measures.

室外排尘风管如果超出建筑物高度时，还应考虑采取避雷措施。

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In the 2st part, the principles of converter gradient control, oxygen lance control, material loading control and dust exhaust control are described.

第二部分论述了转炉炼钢中转炉倾动控制、氧枪控制、上料控制及除尘控制的原理。

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A major disadvantage of coal combustion-and characteristic of industrial cities-has been air pollution by soot, dust, ash, exhaust and large amounts of the greenhouse gas carbon dioxide.

煤炭燃烧的主要缺点——也是工业城市的特色——是烟尘、粉尘、灰渣和废气以及大量的温室气体二氧化碳污染了空气。

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