问题 单项选择题

(二)  某市公交企业拥有公共交通营运车辆800辆,全市经营的公共交通线路长度为2100公里,公共交通线路重复系数为l.4,该城市的用地面积为400平方公里。该公交公司最近决定:在车辆既定的条件下,逐步提高线网密度,使每位乘客步行距离不超过l/2平均站距。据统计,该城市乘客平均乘距为4公里,乘客平均步行速度为5.5公里/小时,车辆平均每次停站时间为1分钟。

该市公共交通线网长度(有公共交通线路通过的街道长度)为()公里。

A.2100

B.1500

C.1450

D.1300

E.1200

答案

参考答案:B

阅读理解

阅读理解

        What does an astronaut (宇航员) eat in space? This is a question that

will puzzle many, as people rarely think of that. In the early space-travel

years, astronauts ate dehydrated (脱水的) foods that were eaten through

straws(吸管). In today's space-age, the food that they eat is totally different.

They eat food in the same way as people do on Earth.

        Astronauts are able to prepare and eat a variety (多样化)of foods in

space. Some can be eaten in their natural form, like fruits; while some need to add water, like noodles. However, there are no refrigerators, so the food has

to be prepared and eaten without being Stored for a long time. When the

astronauts are hungry, they simply eat the food by opening the food ackages and with a fork, knife, and spoon.

       Just like people on Earth, astronauts also eat three meals a day which

include breakfast, lunch and dinner. Sometimes they also eat snacks. The US

space agency NASA has found out that an astronaut's diet reduces(减少) by

about 70% on a space mission, though he has a wide range of foods to

choose from like nuts, chicken, beef, seafood, and candies. Drinks in the

spaceship include coffee, tea, juices, and lemonade.

       Astronauts can also request a particular food that they would like to have in space. Scientists are always experimenting and trying out different space

foods that can be offered to astronauts when on space missions.

1.In the early space-travel years, astronauts  ___________.

A.ate the same food as on Earth

B.drank milk through Straws

C.ate dehydrated food                

D.ate with a fork; knife; and spoon

2.In today's space-age, astronauts  __________

A.can only eat fruit and noodles

B.can't eat anything in a natural way

C.can use the refrigerators to store the food

D.can eat many kinds of food like on Earth.

3.The US space agency NASA has found out that ________in space.

A.an astronaut can eat more than on Earth.

B.an astronaut eat less than on Earth

C.an astronaut eat as much as on Earth

D.an astronaut doesn't have to eat food at all.

4.Astronauts eat three meals a day in space, and they can also __________.

A.cook for themselves    

B.drink some beer

C.smoke      

D.eat snacks

5.Scientists are always experimenting and trying out different space foods

that can be offered to astronauts  ________.

A.when they exercise                  

B.when they are sick

C.when on space missions                

D.when they relax themselves

问答题

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[问题3]
根据该证券的要求及特点,如果您是数据库设计人员你应选择哪种数据库(集中式数据仓库或分布式数据仓库),并用200字结合该证券的现状说明理由。