大庆地区计算冬季施工费的时间？

并联负反馈的______与______并联，起到减小输入阻抗的作用。

学校准备购买一批乒乓球桌．现有甲、乙两家商店卖价如下：甲商店：每张需要700元．乙商店：交1000元会员费后，每张需要600元．设学校需要乒乓球桌x张，在甲商店买和在乙商店买所需费用分别为y₁、y₂元．

（1）分别写出y₁、y₂的函数解析式．

（2）当学校添置多少张时，两种方案的费用相同？

（3）若学校需要添置乒乓球桌20张，那么在那个商店买较省钱？说说你的理由．

脱丁烷塔常规控制项目有（）。

A．混合碳四中碳三含量

B．混合碳四中碳五含量

C．塔釜汽油中碳四含量

D．塔釜汽油中碳三含量

杜比数字影院服务器DSS200内部有几块硬盘（）（每块500G）

A、1

B、2

C、3

D、4

In 1939 two brothers, Mac and Dick McDonald, started a drive-in restaurant in San Bernadino, California. They carefully chose a busy corner for their location. They had run their own businesses for years, first a theater, then a barbecue(烤肉) restaurant, then another drive-in. But in their new operation, they offered a new, shortened menu: French fries, hamburgers, and sodas. To this small selection they added one new idea: quick service, no waiters or waitresses, and no tips.

Their hamburgers sold for fifteen cents. Cheese was another four cents. Their French fries and hamburgers had a remarkable uniformity(一致性), for the brothers had developed a strict routine(程序) for the preparation of their food, and they insisted on their cooks’ sticking to their routine. Their new drive-in became surprisingly popular, particularly for lunch. People drove up by the hundreds during the busy noontime. The self-service restaurant was so popular that the brothers had allowed ten copies of their restaurant to be opened. They were content with this modest success until they met Ray Kroc.

Kroc was a salesman who met the McDonald brothers in 1954, when he was selling milkshake-mixing machines. He quickly saw the special attraction of the brothers’ fast-food restaurants and bought the right to franchise(特许经营) other copies of their restaurants. The agreement included the right to duplicate(复制) the menu, the equipment, even their red and white buildings with the golden arches(拱门).

Today McDonald’s is really a household name. In 1976, McDonald’s had over $ l billion in total sales. Its first twenty-two years is one of the most surprising success stories in modern American business history.

小题1: This passage mainly talks about _______.

A．the development of fast food services

B．how McDonald’s became a billion-dollar business

C．the business careers of Mac and Dick McDonald

D．Ray Kroc’s business talent小题2:Mac and Dick managed all of the following businesses except _______.

A．a drive-in

B．a theater

C．a cinema

D．a barbecue restaurant小题3: We may infer from this passage that _______.

A．Mac and Dick McDonald never became wealthy for they sold their idea to Kroc.

B．the place the McDonalds chose was the only source of the great popularity of their drive-in

C．forty years ago there were lots of fast-food restaurants

D．Ray Kroc was a good businessman小题4:The passage suggests that _______.

A．creativity is an important element of business success

B．Ray Kroc was the close partner of the McDonald brothers

C．Mac and Dick McDonald became broken after they sold their ideas to Ray Kroc

D．California is the best place to go into business