替水泥浆时，要造压差，使油管内液柱压力大于环空液柱压力0.2～0.3MPa。

数据访问页有两种视图方式，它们是（ ）。

A．设计视图和数据表视图

B．设计视图和页视图

C．设计视图和打印预览视图

D．设计视图和窗体视图

患者男性，36岁。农民。高热持续1周，畏寒、全身痛、腰背肌肉痛，腓肠肌压痛，球结膜充血，蛋白尿(+++)，腹股沟淋巴结蚕豆大小，病程第5天起咳嗽咯血不断，气促，喉中痰声噜噜，心率110次/分，口唇青紫。

有助于诊断的检查是

A．流行性出血热病毒特异IgM

B．钩端螺旋体凝集试验

C．OT试验

D．胸片

E．痰培养

质量通病防治措施中要求，变电站电缆沟伸缩缝与电缆沟垂直，应（）、缝宽一致，上下贯通、缝中不得连浆、填缝要求饱满，填缝材料应符合设计要求，表面密封处理应美观。

A、不断开

B、全断开

C、断开1/2

D、断开1/3

ZZ8L-2.5型矿用煤电钻综保的保护功能主要是载频短路保护，先导控制和漏电保护三大部分。（）

In 1998 consumers could purchase virtually anything over the Internet. Books, compact discs, and even stocks were available from World Wide Web Sites that seemed to spring up almost daily. A few years earlier, some people had predicted that consumers accustomed to shopping in stores would be reluctant to buy things that they could not see or touch in person. For a growing number of time-starved consumers, however, shopping from their home computer was proving to be a convenient alternative to driving to the store.

A research estimated that in 1998 US consumers would purchase $ 7.3 billion of goods over the Internet, double the 1997 total. Finding a bargain was getting easier, owing to the rise of online auctions and Web sites that did comparison shopping on the Internet for the best deal.

For all the consumer interest, retailing in cyberspace was still a largely unprofitable business, however. Internet pioneer Amazon. com, which began selling books in 1995 and later branched into recorded music and videos, posted revenue of $153.7 million in the third quarter, up from $37.9 minion in the same period of 1997. Overall, however, the company’s loss widened to $45.2 million from $9.6 million, and analysts did not expect the company to turn a profit until 2001. Despite the great loss, Amazon. com had a stock market value of many billions, reflecting investors’ optimism about the future of the industry.

Internet retailing appealed to investors because it provided an efficient means for reaching millions of consumers without having the cost of operating conventional stores with their armies of salespeople. Selling online carried its own risks, however. With so many companies competing for consumers’ attention, price competition was intense and profit margins thin or nonexistent. One video retailer sold the hit movie Titanic for $9.99, undercutting the $19.99 suggested retail price and losing about $6 on each copy sold. With Internet retailing still in its initial stage; companies seemed willing to absorb such losses in an attempt to establish a dominant market position.

"For all the consumer interest"(Paragraph 3)means（）

A. to the interest of all the consumers

B. for the interest of all the consumers

C. all the consumers are much interested

D. though consumers are very much interested