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1·Soot is the product of the imperfect combustion of fuel.

煤烟是燃料不完全燃烧的产物。

2·Soot is usually the product of the imperfect combustion of fuel.

煤烟通常是燃料不完全燃烧的产物。

3·The experiments in laboratory and the combustion phenomena in actual boilers show that the most part in the said difference to be imperfect combustion loss.

实验室试验及实际锅炉燃烧现象表明，其差值的极大部分为不完全燃烧损失。

4·Influencing factors on heat efficiency of tubular heaters are analyzed, which mainly include excess air factor, imperfect combustion and exhaust temperature.

分析了影响管式加热炉热效率的因素，主要包括过剩空气系数、不完全燃烧、排烟温度等。

5·The experiments in laboratory and the combustion phenomena in actual boilers show that the most part in the said difference to be imperfect combustion loss. Hence, a huge...

实验室试验及实际锅炉燃烧现象表明，其差值的极大部分为不完全燃烧损失。