离开实验室的空气要过滤。
农业和林业用拖拉机和自驱动机械。驾驶室环境。第4部分：空气过滤元件试验方法。
Tractors and self-propelled machines for agriculture and forestry - Operator enclosure environment - Part 4: air filter element test method.
空气经过过滤和加热，进入干燥器顶部空气分配器，热空气呈螺旋状均匀地进入干燥室。
After filtration and heating of air into the dryer at the top of the air distributor, hot air spirals into the drying chamber evenly.
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