In a fan pattern, the trend line is drawn along the upper edge of the price activity.
在一个扇形形态中，趋势线沿着价格活动区域的上边缘延伸。
Fan regulation, which box on the bed material to maintain the upper-vacuum, maintain good dry environment and prevent dust leakage.
调节引风机，使上箱体中床层物料上部保持微负压，维持良好的干燥环境并防止粉尘外泄（略）。
Each boiler combustion system is equipped with 2 FDFs and 2 IDFs, with upper limit prescribed in standard taken into consideration for selection of fan delivery model.
每台锅炉燃烧系统设2台锅炉鼓风机及2台引风机。风机风量选型按照设计规范上限。
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