椎管内穿刺时脑脊液流出,表示穿刺针到达()A.软脊膜下面 B.硬膜下隙 C.硬膜外隙

题型:单项选择题

问题:

椎管内穿刺时脑脊液流出,表示穿刺针到达()

A.软脊膜下面

B.硬膜下隙

C.硬膜外隙

D.蛛网膜下隙

E.黄韧带

考点:神经外科学(医学高级)强化练习题强化练习题题库
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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.

1()

A.assessable

B.available

C.acceptable

D.abundant

题型:单项选择题

TCP/IP模型的传输层有两个协议:UDP和TCP。其中,TCP是一种 (30) 协议。在TCP/IP参考模型中,传输层的主要作用是在互联网络的源主机与目的主机对等实体之间建立用于会话的 (31) 。在传输层定义的是 (32)

A.FTP
B.RIP
C.TCP
D.IP

题型:单项选择题

岩浆岩的分类依据是什么?

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采用托收方式结算时,出口商应注意_________。 ( )

A.考察出口商的资信和经营作风

B.了解进口国的贸易和外汇管制

C.了解代收行的资信

D.出口合同争取采用FOB条件成交

题型:单项选择题

下列对GMP阐述不正确的为()

A、良好操作规范

B、是一种食品安全和质量保证体系

C、危险评价客观方法

D、反映了一般的管理指标

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