直轴的方法大致有以下几种（） A.机械加压法 B.捻打法 C.局部加热法 D.机加工

In 1998 consumers could purchase virtually anything over the Internet. Books, compact discs, and even stocks were (1) from World Wide Websites that seemed to (2) almost daily a few years earlier, some people had predicted that consuners accustomed to shopping in stores would be (3) to buy things that they could not see or touch (4) . For a growing number of time-starved consumers, however, shopping from their home computer was proving to be a convenient (5) to driving to the store.

A research estimated that in 1998 US consumers could purchase $ 7.3 billion of goods over the Internet, double the 1997 total. Finding a bargain was getting easier, (6) the rise of online auctions and Websites that did comparison shopping on the Internet for the best (7) .

For all the consumer interest, (8) in eyberspaee was still a largely (9) business, however. Internet pioneer Amazon. eom, which began selling books in 1995 and later (10) into recorded music and videos, posted (11) of $ 153.7 million in the third quarter, up from $ 37.9 million in the same period of 1997. Overall, (12) , the company’ s loss widened to $ 45.2 million from $9.6 million, and analysts did not expect the company to turn a profit (13) 2001. (14) the great loss, Amazon. tom had a stock market value of many billions, reflecting investors’ (15) about the future of the industry.

Internet retailing appealed (16) investors because it provided an efficient means for reaching millions of consumers without having the cost of operating (17) stores with their armies of salespeople. Selling online carried its own risks, however, (18) so many companies competing tor consumers’ attention, price competition was (19) and profit (20) thin or nonexistent.

11（）

A.revenue

B.tax

C.tariff

D.avenue

如图甲乙丙丁是以时间为横轴的匀变速直线运动图象，下列说法正确的是(      )

A．甲是a——t图象

B．乙是x——t图象

C．丙是a——t图象

D．丁是v——t图象

《突发公共卫生事件应急条例》规定，对传染病病人和疑似传染病病人，应当采取什么措施？

除《莫斯科宣言》外，莫斯科会议还发表了《和平宣言》。签署这一宣言的国家数目是（）

A.64

B.23

C.16

D.10

推力盘、叶轮及联轴器的端面与转子轴线的垂直度偏差太大时，会产生哪些后果？