甲 乙
丙
则:
①下列属于空气污染物的是(填序号,下同)。
A O3
B CO
C CO2
D PM10
②下列行为会增加空气中PM2.5的是。
A 治理工地扬尘
B 露天焚烧垃圾
C 使用公共自行车
D 鼓励使用太阳能热水器
③电解水的化学反应方程式为,该实验说明水是由元素组成。
④随着净水技术的发展,一种净水机可以将水厂原水直接净化为饮用水,其中处理流程如图所示:
步骤Ⅰ对应的作用,超滤膜可起到过滤不溶性杂质的作用,实验室进行过滤操作所需要的仪器有带铁圈的铁架台、烧杯、漏斗(含滤纸)和(填仪器名称)。
⑤硬水中含有较多的离子是(填离子符号),在家中采用的方法可将硬水软化。
C
Although people everywhere seem to enjoy drinking coffee, they don't all have the same coffee culture. In Europe, for example, coffee shops are common places for people to meet friends and to talk while they drink coffee. On the other hand, places like this were not as common in North America in the past. Instead, people in North America liked to drink coffee in their homes with friends. The coffee culture in the USA changed when Starbucks (星巴克) coffee shops spread across the country.
The first Starbucks coffee shop opened in 1971 in downtown Seattle, Washington, in the USA. It was a small coffee shop that cooked its own coffee beans. The coffee shop's business did well, and by 1981 there were three Starbucks stores in Seattle.
Things really began to change for the company in 1981. That year, Howard Schultz met the three men who ran Starbucks. Schultz worked in New York for a company that made kitchen equipment. He noticed that Starbucks ordered a large number of special coffee makers, which caused his great interest. Schultz went to Seattle to see what Starbucks did. In 1982, the original Starbucks owners hired Schultz as the company's head of marketing (市场营销).
In 1983, Schultz traveled to Italy. The special environment of the espresso (浓咖啡) bars there caught his eyes. Back in the USA, Schultz created an environment for Starbucks coffee shops that was comfortable and casual, and customers everywhere seemed to like it. Starbucks began opening more stores across the USA. Then the company opened coffee shops in other countries as well. Today, there are more than 16,000 Starbucks coffee shops all over the world.
However, that does not mean Starbucks has not had problems. In fact, many Starbucks stores have closed over the past few years. On the one hand, this is because there were too many coffee shops competing for business in one small area. On the other hand, stores in some countries closed because the coffee culture there did not match with the "feel the same everywhere" environment offered by Starbucks.
a. This man helped to make Starbucks a huge coffee company.
b. Starbucks began as a small coffee company in Seattle in the USA.
c. He went to Seattle to learn about the company and later worked for it.
d. Howard Schultz noticed Starbucks ordered lots of special coffee makers.
(做出猜想)猜想一:变质的干燥剂成分是氢氧化钙。
猜想二:变质的干燥剂成分是。
猜想三:变质的干燥剂成分是。
请你设计实验进行探究,完成下面的实验报告:
实验操作 |
实验现象 |
实验结论 |
|
|
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方案一:取相同质量的两种液体物质,吸收相等的热量,比较温度的变化。
方案二:取相同质量的两种液体物质,升高相同的温度,比较加热时间的长短。如表是晓强探究甲、乙两种液体的吸热能力时记录的实验数据。
液体种类 |
液体质量m/g |
初温t1/℃ |
末温t2/℃ |
加热时间t/min |
甲 |
10 |
30 |
40 |
6 |
乙 |
10 |
30 |
40 |
3 |