所谓内对焦(Internal Focussing，简称IF)，是指镜头在对焦时，前后镜组都不移动，而由镜头内部的一个对焦镜片组的移动来完成对焦，对焦时镜头长度保持不变。
根据干熄炉内焦炭换热的特点，用干熄炉模型对焦炭粒度和冷却气体流量等参数进行了试验。
According to the feature of coke heat exchanging in CDQ chamber, the test on the parameters such as coke size and cooling gas flow was made with the CDQ model.
讨论了高炉内温度和失碳率对焦炭强度的综合影响以及焦炭强度在高炉内的分布规律。
The integrated influence of the temperature and LC on coke strength and change of coke strength in blast furnace are discussed.
利用测量装置对焦平面和多个离焦面内的能流密度分布进行测量，并分析每个面内的聚焦光斑特性。
The flux density distributions on focus plane and many defocusing planes are measured by the measurement equipment and focusing characteristics of the spots on each plane are also analyzed.
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