冷行业:冷是为了放松。气体的放松产生冷,而气体的压缩产生热,就像给自行车轮胎打气一样。1925年的匿名插图。私人收藏。(The cold industry: cold for relaxation. The relaxation of the gases produces cold while their compression produces heat as when inflating a bike tire. Anonymous illustration from 1925. Private collection.)匿名匿名 |
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日期不详 · Engraving
· 图片ID: 915785
Private Collection / Bridgeman Images |
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