[单项选择] (66) is a channel’ s capacity which directly reflects the data transfer rate of the channel. (67) functions in a NetWare network which is used to define addressing schemes. (68) is a network layer device that suports multiple LAN interfaces and segments LANs into smaller collision and broadcast domains. (69) ．is the popular LAN develped under the direction of the IEEE 802.3. (70) is a device which enables digital microcomputers to communicate across analog telephone lines.

A. The volume
B. The bandwidth
C. The noise
D. The delay

[单项选择] (66) is a channel’ s capacity which directly reflects the data transfer rate of the channel. (67) functions in a NetWare network which is used to define addressing schemes. (68) is a network layer device that suports multiple LAN interfaces and segments LANs into smaller collision and broadcast domains. (69) ．is the popular LAN develped under the direction of the IEEE 802.3. (70) is a device which enables digital microcomputers to communicate across analog telephone lines.
A. The volume B. The bandwidth
C. The noise D. The delay

[单项选择]

The (66) is a channel’s capacity which directly reflects the data transfer rate of the channel.
(67) functions in a NetWare network which is used to define addressing schemes.
The (68) is a network layer device that supports multiple LAN interfaces and segments LANs into smaller collision and broadcast domains.
(69) is the popular LAN developed under the direction of the IEEE802.3.
The (70) is a device which enables digital microcomputers to communicate across analog telephone lines.

（66）处填（）。
A. volume
B. bandwidth
C. noise
D. delay

[填空题]A website is a channel through which companies can promote their products and compete ______.

[单项选择]

Different quality factors of software can be reflected upon user's different points of view，through product running，product modification and product transformation.Of the following properties，which one is connected with product running （） 　　
Ⅰ.Correctness 　　
Ⅱ.Robustness 　　
Ⅲ.re-use

A. Ⅰ
B. Ⅱ
C. Ⅰ, Ⅱ
D. 以上都是

[单项选择] Under proper conditions, sound waves will be reflected from a hillside or other such obstruction. Sound travels at the rate of about one-fifth of a mile per second. If the hill is eleven hundred feet away, it takes two seconds for the sound to travel to the hill and back. Thus, by timing the interval between a sound and its reflection (the echo), you can estimate the distance to an obstruction. During World War I1 the British used a practical application of this principle to detect German planes on their way to bomb London before the enemy was near the target. They used radio waves instead of sound waves, since radio waves can penetrate fog and clouds. The outnumbered Royal Air Force (RAF) always seemed to the puzzled Germans to be lying in wait at the right time and never to be surprised (袭击). It was radio echoes more than anything else that won the Battle of Britain. Since the radio waves were used to tell the direction in which to send the RAF planes and distance to send
A. were more exact than sound waves
B. could not be detected
C. could penetrate fog and clouds
D. were easier to use than sound waves