单选题
发布日期:2021-03-18
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绝热材料是指能阻滞热流传递的材料,又称热绝缘材料。传统绝热材料,如玻璃纤维、石棉、岩棉、硅酸盐等,新型绝热材料,如气凝胶毡、真空板等。它们用于建筑围护或者热工设备、阻抗热流传递的材料或者材料复合体,既包括保温材料,也包括保冷材料。绝热材料一方面满足了建筑空间或热工设备的热环境,另一方面也节约了能源。因此,有些国家将绝热材料看作是继煤炭、石油、天然气、核能之后的“第五大能“。
规格型号:是反映商品性质、性能、品质等一系列的指标,一般由一组字母和数字以一定的规律编号组成。如品牌、等级、成分、含量、纯度、大小(尺寸、重量)等。商品名称和规格型号要规范准确详尽,这样才能够保证归类准确、统计清晰。
堆放,读音duī fàng,汉语词语,意思是成堆地放置。
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The Ancient Greek philosopher Pythagoras is best known today for his mathematical theorem,which haunts the dreams of many geometry students, but for centuries he was also celebrated as the father of vegetarianism.A meatless diet was referred to as a"Pythagorean diet" for years, up until the modern vegetarian movement began in the mid-1800s. While Pythagoras was an early proponent of a meatless diet, humans have been vegetarians since well before recorded history.Most anthropologists agree that early humans would have eaten a predominantly plant-based diet; after all, plants can't run away.Additionally, our digestive systems resemble those of herbivores closer than carnivorous animals.Prehistoric man ate meat, of course,but plants formed the basis of his diet. Pythagoras and his many followers practiced vegetarianism for several reasons, mainly due to religious and ethical objections.Pythagoras believed all living beings had souls.Animals were no exception, so meat and fish were banished from his table.Strangely enough, he also banished a vegetable that has a place of honor on most vegetarian menus today, the bean.His followers were forbidden to eat or even touch beans, because he thought beans and humans were created from the same material.Fava beans were especially bad, as they have hollow steams that could allow the souls of the dead to travel up from the soil into the growing beans. While the edict against beans was lifted not long after Pythagoras' death, his followers continued to eat a meatless diet.His principles influenced generations of academics and religious thinkers, and it was a group of these like-minded individuals who founded the Vegetarian Society in English in the mid-1800s.The virtues of temperance, abstinence and self-control were all tied to vegetarian Ideals, while lust, drunkenness and general hooliganism all resulted from a diet too rich in meat products.Notable early vegetarians included Leo Tolstoy, George Bernard Shaw, Mahatma Gandhi and American Bronson Alcott, a Transcendentalist teacher, reformer and the father of"Little Women" author Louisa May Alcott. It wasn't until the 1960s that vegetarianism moved into mainstream American life and the movement's growth picked up speed in the 1970s when a young graduate student -named Francis Moore Lappe wrote a book called Diet for a Small Planet.In it, she advocated a meatless diet not for ethical or moral reasons, but because plant-based foods have much less impact on the environment than meat does.Today, many vegetarians refuse meat because of animal rights issues,or concerns over animal treatment, a principle first espoused in Peter Singer's 1975 work Animal Liberation.Which of the following is true according to the passage?
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图示两刚架的EI均为常数,已知EI a=4EI b2,则图a)刚架各截面弯矩为图b)刚架各相应截面弯矩的倍数关系为:()
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绝热材料应妥善保管,按规格型号分类堆放,其堆放高度不宜超过()。
绝热材料应妥善保管,按规格型号分类堆放,其堆放高度不宜超过()。
绝热材料应妥善保管,防止()等发生。
在2.0KPa压力下的相对变相在20%的绝热材料,称为()绝热材料。
在2.0KPa压力下的相对变相在20%的绝热材料,称为()绝热材料。
工程中通常把λ<0.23W/(m2K)的材料称为绝热材料,下面()属于绝热材料。
某冷库壁内外层砖壁厚各为12cm,中间夹层填以绝热材料厚10cm。砖的导热系数为0.7W/(mK),绝热材料导热系数0.04W/(mK)。墙的外表面温度为10℃...
粘贴法是用各类胶粘剂将绝热材料制品直接粘贴在设备及管道表面,最适宜的轻质绝热材料有()。
好的绝热材料应具有()。
绝热材料