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16#
发表于 2022-10-6 10:48:28
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Day 17
1. 晒皮肤
劝人们要晒皮肤的话去晒灯不要直接晒太阳,因为晒灯里大部分是UVA,太阳里面还有很多UVB,UVC,那些对人体有害的,问怎么削弱。
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1⃣️UVB和UVC可以通过一定手段防御,如防晒霜
2⃣️晒灯里有其他成分,有害性大于或等于UVB和UVA
2. 乡下的小鱼场
大致是说乡下小店么离渔场又近,进价又便宜,生意上的开销和城里大店一样,但是生意依然不好,问为啥啊。
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cost少,revenue差,那么就是sales不好。从供需关系上找原因。
1⃣️乡下小店面对的客群少(周边居民少、居民有其他方式吃到鱼等)
2⃣️乡下小店供给不如城里,导致大家宁可去城里买(城里可以直接烹饪、还有其他地方的鱼类可选等)
3. Lead 会不会生病
说原来铅中毒的人很多,因为原来的水管都是铅(lead)做的。水里面含了铅,人喝了就中毒了。但是后来有人发现有些地方的人的血液里的铅含量很少。问哪一个可以解释这个问题。
认为是下面这个题:
Reviewer: The author of a recent book argues that lead contributed to many public health problems in the late nineteenth and early twentieth centuries. He claims that the main sources of this pollutant were urban water-delivery systems, which used lead pipes that leached lead into the water supply. But my own research on municipalities that used lead pipes during the period in question has shown that the inhabitants of several of them did not exhibit symptoms of lead poisoning, so the pipes are most likely not the primary culprit.
Which of the following would, if true, most weaken the reviewer's reasoning?
(A) In certain areas, exposure to hard water--water with a high mineral content--promotes the formation of a protective coating on the interior of lead pipes.✅
(B) In the late nineteenth and early twentieth centuries, many household fixtures and consumer products contained lead.
(C) Lead was introduced into gasoline in the 1920s, during which time lead-poisoning symptoms increased in many locales.
(D) Several cities that used lead pipes exhibited unusual rates of convulsive disorders and other conditions associated with lead exposure.
(E) The author in question notes that other factors, including inadequate sewer systems and urban crowding; caused widespread outbreaks of infectious diseases. |
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