剪彩者可以是一人、也可以是几个人，但不应多于（）人。A．5 B．6 C．7 D．8

下述有关城市总体规划与土地利用总体规划之间关系的描述中，哪项是错误的( )

A．市域土地利用总体规划是市域城镇体系规划的组成部分
B．土地利用总体规划和城市总体规划是相互协调和衔接的关系
C．城市总体规划中的用地选择、用地增量指标的确定，应与土地利用总体规划充分协调
D．城市规划区内的用地布局应主要根据城市空间结构的合理性进行安排

有一台直流电动机，其输入功率为6千瓦，输出功率为5千瓦，则该电机的效率（），损耗（）。

A、100%，1千瓦

B、83%，1千瓦

C、100%，2千瓦

D、90%，2千瓦

Making group purchases of famous local products and cosmetics (化妆品) with co-workers has become a common habit for the nine-to-fivers. But if your impression of group buys is still a piece of paper being passed around the office, everyone writes their details down, or endless phone calls or faxes to the supplier, then I’m sorry to say you’re behind the times. The popular way to make such purchases today is to get on line, form a special “group” and shop together. Not only can you save money by getting the best discounts, but it’s also a great way to meet new people.

“You could cut off my clicking finger and I’d still keep shopping this way!” so goes a common comment left by customers of China’s famous e-commerce website “Taobao”. Some even refer to group purchasing as a “path of no return”, saying that “Once you’ve tried it, you’ll get hooked!”

The origins of this new trend can be found in China’s well-known online consumers’ BBS, 55BBS, and the shopping boards. Since most BBS users are “white-collared workers and students who live in concentrated areas, buying clothes, food, and so on as a group saves on delivery costs as well as – if they meet the seller’s criteria (标准) – earn gifts, discounts, and frequent shopper points.

Users of this online group shopping boards purchase a lot of different items, from Japanese and Korean style clothes and Ugg boots, through fake eyelashes (假睫毛), stockings, food seasonings (调味品), and kitchen knives, to cosmetic masks and online college courses. All kinds of things have people coming together in groups to buy them, and the pickups are often organized on college campuses or office buildings.

Internet observer Liu Chenxi points the purchasing behavior that these online groups’ power creates a “team” effect. Unlike e-commerce sites driven by individuals’ purchases, sites that create this team effect have users that come together to achieve a common goal. The Internet has made this joining of forces to form group buying power possible, and it continues to snowball all around us.

68. The passage mainly deals with _________.

A. group purchases with co-workers    

B. online group purchases

C. how to do shopping online             

D. buying famous local products and cosmetics

69. What does the word “hooked” in Paragraph 2 probably mean?

A. excited               B. lost                   C. addicted           D. bored

70. According to the text, this kind of purchase has some benefits EXCEPT________.

A. earning gifts                                         B. making new friends

C. saving money                                D. saving time

71. What can we infer from the text?。

A. Online group shopping will become more and more popular.

B. The goods are usually delivered to each doorstep.

C. Doing shopping online is not reliable.

D. People prefer to do group purchases with their co-workers.

微血管运动增强可见于（）.

A.正常运动情况

B.休克代偿期

C.休克可逆性失代偿期

D.DIC期

E.脏器功能衰竭期

泥浆油、气侵时，其性能主要有什么变化？