原子的K壳层最多可容纳的电子数是() A.6 B.5 C.4 D.3 E.2

题型:单项选择题 A1/A2型题

问题:

原子的K壳层最多可容纳的电子数是()

A.6

B.5

C.4

D.3

E.2

考点:放射医学技师放射技师相关专业知识放射技师相关专业知识考前冲刺三
题型:单项选择题 A1/A2型题

求经过点A(5,2),B(3,2),圆心在直线2x-3y-3=0上的圆的方程.

题型:单项选择题 A1/A2型题

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

Most drinks stating that they are fruit-flavored(水果味道的)contain no fruit at all, while most of the rest contain only a small quantity of fruit, according to a study carried by the British Food Commission.

“Shoppers need to check the labels(标签)before buying drinks, though sometimes the actual content can be non-existent,” said Food Commission spokesperson Lan Tokelove. “Food production is highly competitive.   小题1:   It will increase profits, and consumers won’t always realize they are being tricked.”

Flavorings are focused on the flavors of natural food products such as fruits, meats and vegetables, or creating flavor for food products that do not have the desired flavors. Researchers analyzed the contents of 28 strawberry-flavored products sold in stores.  小题2: Of the 11 products that did contain strawberries, five of them contained less than one percent real fruit. In addition, each juice box contained nearly eight teaspoons of sugar.

小题3:  Let’s take jam as an example. Some strawberry-flavored jam was labeled as containing no artificial colors, flavors, or sweeteners, but it contained absolutely no strawberries at all.

小题4: Consumers have the rights to know clearly about what they have bought. Under current UK law, Food packages do no not have to distinguish between natural and artificial flavoring. “Describing a product as strawberry flavor and covering the surface of the packed with pictures of strawberries is misleading.  小题5: Unfortunately, it is also legal and widespread,” Tokelove said.

A.The products which contain real fruit are popular with people.

B.Even products advertised as more natural often contained no fruit.

C.They found that about 60 percent of them didn’t contain any fruit at all.

D.If companies can cut their costs by using flavoring, they are likely to do so.E. It is important and necessary to demand a small amount of flavoring in the products.

F. Actually the product contains just a tiny percentage of strawberry or even no fruit at all.

G. The Food Commission suggested all flavors used in a product should be listed on the packaging.

题型:单项选择题 A1/A2型题

1986年以来,我国已有百余所医院定期上报、反馈医院内感染与病原菌耐药的信息,这属于流行病学研究中的

A.生态学研究

B.疾病监测

C.描述性研究

D.病例对照研究

E.实验流行病学

题型:单项选择题 A1/A2型题

在最近召开的省委十届三次全会上,紧扣四川省发展主要矛盾,针对四川人口多、底子薄、欠发达、发展不平衡提出了“三大战略”,这三大战略是指要实施多点多极支撑发展战略,“两化”互动、城乡统筹发展战略,()发展战略。

A、创新驱动

B、提升首位城市

C、梯次竞相跨越

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矢量数据的实体数据结构与拓扑数据结构有什么不同?

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