4 creative ways people kept cool before air conditioning Philadelphia-based musical instrument maker John Cram invented a clever cooling device in the 1780s. People used their feet to operate the fan that moved above their head, much like someone would power an old sewing machine.Fan chairs Benj...
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本文为你揭秘古代人夏日纳凉的4个妙招.1.风扇椅18世纪80年代,美国费城的乐器匠人约翰·克莱姆发明了一种巧妙的纳凉装置.人们用脚让悬在头顶的风扇转起来,就像运作老式缝纫机一样.据称,本杰明·富兰克林也有一台风扇椅,但是这种设备似乎在大众市场上不太吃香.王硕语数外学习...
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This portable air-conditioning unit has built-in wheels and two handles, which makes it easy to maneuver from room to room. It generates 12,000 BTUs of cooling power, which is enough to keep a 530-square-foot space at a comfortable temperature, even on the hottest days, so it's well...
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Maximum Airflow Rate 400 Featured Function High loading QTY Private Mold Yes Remote Control YES Refrigerant R290/R410A/R32 Fan Speed 3 Working Condition T1 NOISE LEVEL ≤ 65 dB(A) LOGO Customized Logo Acceptable Material ABS Plastic Packaging and delivery ...
___ (equip) with air conditioning,the classroom is cool to stay in summer.相关知识点: 试题来源: 解析 equip"配备,装备"是动词,句子已有谓语动词is,横线处用非谓语。逻辑主语the classroom与equip是被动关系,所以用过去分词作状语,位于句首,首字母要大写。故填:Equipped。结果一...
Before the invention of air conditioning, it was really hard to cool things. You had to take something that was very cold and move it to places that were hot. The early 19th-century business of New England companies shipped large carved ice cubes around the country. And there were ...