在中国药典中，关于药品卫生标准中对染菌数的限度要求的表述，正确的有（）。

An internet is a combination of networks connected by()

A.modems

B.routers

C.switches

D.computers

An internet is a combination of networks connected by (1). When a datagram goes from a source to a？ (2), it will probably pass many (3) until it reaches the router attached to the destination network. A router receives a？ (4) from a network and passes it to another network. A router is usually attached to several networks. When it receives a packet, to which network should it pass the packet？ The decision is based on optimization: Which of the available (5) is the optimum pathway？

空白（4）处应选择（）

A. destination

B. resource

C. packet

D. source

An internet is a combination of networks connected by (1). When a datagram goes from a source to a？ (2), it will probably pass many (3) until it reaches the router attached to the destination network. A router receives a？ (4) from a network and passes it to another network. A router is usually attached to several networks. When it receives a packet, to which network should it pass the packet？ The decision is based on optimization: Which of the available (5) is the optimum pathway？

空白（2）处应选择（）

A. user

B. host

C. city

D. destination

An internet is a combination of networks connected by (1). When a datagram goes from a source to a？ (2), it will probably pass many (3) until it reaches the router attached to the destination network. A router receives a？ (4) from a network and passes it to another network. A router is usually attached to several networks. When it receives a packet, to which network should it pass the packet？ The decision is based on optimization: Which of the available (5) is the optimum pathway？

空白（5）处应选择（）

A. pathways

B. routers

C. diagrams

D. calls

An internet is a combination of networks connected by (1). When a datagram goes from a source to a？ (2), it will probably pass many (3) until it reaches the router attached to the destination network. A router receives a？ (4) from a network and passes it to another network. A router is usually attached to several networks. When it receives a packet, to which network should it pass the packet？ The decision is based on optimization: Which of the available (5) is the optimum pathway？

空白（3）处应选择（）

A. destinations

B. routers

C. packets

D. computers

A．When work PCs were connected to each other via Local Area Networks （LANs）

B．When work PCs were connected to each other via Internet

C．When people showed their interest in work PCs

D．When more and more businessmen noticed the potential market for work PCs

() are collections of two or more connected computers.

A、VPN

B、Modem

C、Networks

D、Cable

If your computer is connected to a host that is an ISP(Internet Service Provider),you can negotiate with the master of the host that your computer is connected to the Internet as a host rather than a terminal.

Begun in the late 1960s by Pentagon weapons researchers as a system for easing

communication between computers in disparate electric networks,

the Internet has evolved 【M1】______

into a popular vehicle for scientific research, communication, entertainment, and more. It

links together thousands of computer networks such as

those belonging to corporations, 【M2】______

commercial services, universities, and research centers, joining them as branches on a tree

to larger networks known as backbones. Once a computer is on-line, that is, connected by

modem or networking equipment of the Internet,

the user can search through data banks 【M3】______

for documents, chat with other computer users,

or instant send opinions and observations 【M4】______

to the likes of President Bill Clinton, film critic Roger Ebert, or rocker Billy Idol (just to name

a few). No central governing body runs the Internet,

and nobody has an exact census of 【M5】______

users. But estimates of the number already range from around 10 million to as high as 5

million. Well over 10,000 separated computer networks

are connected by the Internet, and 【M6】______

total traffic was expected to double during 1993. Today, the Internet is free resources and

commercial services that provide databases and computer files with a fee.

Publishers are 【M7】______

seeking to make books and periodicals available on the Internet as a profit-making adventure.

Meanwhile, works in the public domain have begun appearing on the Internet for【M8】______

users to "upload" to their computers virtually free of charge.

With electronic access to data 【M9】______

from all over the world, scholarly research that in the past would have required months of

travel could now be done at one' s desk. 【M10】______

【M1】

The Internet is a world wide collection of networks that use the TCP/IP protocols to facilitate data transmission and exchange.()