When various manipulations disturb the thermal boundary layer inside or the condensate film and gas-vapor diffusion layer outside, the heat transfer effect will be better or be worse off.
各种操作条件只有影响到管程的温度边界层或壳程的冷凝液膜层和气-汽扩散层，才能强化或恶化传热过程。
It is characterized by that it is formed from 5 layers of plastic pipe, adhesive layer, steel pipe, alloy layer and hole-sealing film in turn fron inside to outside.
其特征在于该合金钢塑复合管由5层组成，从里到外依次是塑料管、粘结剂层、钢圆管、合金层、封孔膜。
Peel the grapefruit, remove the film layer and only keep the inside flesh then tear into little pieces;
大柚子去外皮后，再去掉瓣上的薄皮掰成小块。
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