三鹿婴幼儿配方奶粉导致多地婴儿患肾结石,是因不法份子添加了三聚氰胺,。三聚氰胺的

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问题:

三鹿婴幼儿配方奶粉导致多地婴儿患肾结石,是因不法份子添加了三聚氰胺,。三聚氰胺的化学式为C3N6H6

(1) 三聚氰胺的相对分子质量是      

(2)三聚氰胺中碳、氮、氢元素质量之比是     

(3)三聚氰胺中碳元素的质量分数是      

考点:物质组成元素的质量比化学式的写法和意义物质组成元素的质量分数化合价的求法
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电机车的车架两端装有缓冲器和连接器;缓冲器有两种:架线电机车采用()的刚性缓冲器,蓄电池采用()的弹性缓冲器。

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破产重整即破产,而且是由债权人申请的。( )

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Ever wondered why some businesses fail and others seem to go from strength to strength(越来越兴旺发达)? One of the major reasons for success or failure in any business is the choice of location. The ABS can be of great help in choosing the most likely place to set up your business. Whether it’s simple or a complex business.

Case study one

A Sydney doctor specializing pediatrics(小儿科) was hoping to set up a practice outside the metropolitan area, probably on the northern coast of New South Wales. He was unsure of the best place in this region and came to the ABS for help. The ABS was able to put together a report containing details of the proportion of the children in particular areas, along with information on regions with the highest birth rates. This enabled the doctor to work out where future demand for his services would be.

Case study two

A suburban retailer(零售商)in Perth owned a shoe store which stocked a wide range of shoes for men, women and children. There had been an increase in the number of similar shoe stores in the suburban shopping center and the owner wanted to assess the possibility of switching to selling imported shoes and handbags for women only. In order to ensure whether there was a market for these products, the retailer needed to obtain details of income by age, sex, and occupation for all the women in the city of Perth. Using information from the 1996 Census(普查)of Population and Housing, the ABS was able to provide this type of information in a detailed report. With the information, the retailer was able to believe that there were enough professional working women in the area with middle to high incomes, which makes his business possible.

1. What information did the Sydney doctor get from the ABS about the northern coast of New South Wales?

A. The number of medical practices there.

B. The detailed information about the children.

C. Its present and future economic situations.

D. The ideal place to start a practice there.

2. The retailer wanted to switch to selling imported shoes and handbags for women because________.

A. there were more and more working women

B. he wanted to enlarge the original store

C. there were more and more shoe stores

D. imported products were popular

3. What does the ABS do for its customers?

A. Doing research work in the fields.

B. Suggesting the most potential market.

C. Providing considerable amounts of data.

D. Predicting the possible consumer goods.

4. This passage is most probably a(n) _____________.

A. handout for management           B. income report

C. advertisement                   D. plan for a project

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患者腹痛,结合图像,最可能的诊断是()

A.淋巴瘤

B.幽门螺杆菌感染

C.胃炎

D.浸润性胃腺癌

E.以上都不是

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紫外线消毒空气时,每10m2安装30瓦紫外线灯管及其有效距离和时间是()

A.<60cm,>15min

B.<1.0m,>20min

C.<1.5m,>25min

D.<2m,>30min

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