(9)
- A．message and packet
- B．packet and frame
- C．stream and datagram
- D．flow and block
-
(13)
- A．material
- B．equipment
- C．medium
- D．channel
-
(14)
- A．repeaters
- B．radars
- C．telephones
- D．antennas
-
(12)
- A．transmitted
- B．transformed
- C．converted
- D．delivered
-
(11)
- A．reflex
- B．distort
- C．bend
- D．absorb
-
In the following essay, each blank has four choices. Choose the best answer and write-down on the answer sheet.
Microwave communication uses high-frequency(71)waves that travel in straightlines through the air. Because the waves cannot(72)with the curvature of the earth, they can be(73)only over short distance. Thus, microwave is a good(74)for sending data between buildings in a city or on a large college campus. For longer distances, the waves must be relayed by means of "dishes" or(75). These can be installed on towers, highbuildings, and mountain tops.
- A．optical
- B．radio
- C．electrical
- D．magnetic
-
(9)
- A．message and packet
- B．packet and frame
- C．stream and datagram
- D．flow and block
-
(8)
- A．full-duplex
- B．half-duplex
- C．simplex
- D．complex
-
(6)
- A．is made of
- B．composed of
- C．is composed of
- D．is consisted of
-
(7)
- A．Email address and IP address
- B．MAC address and port address
- C．MAC address and IP address
- D．port number and IP address
-
(4)
- A．medium
- B．media
- C．matter
- D．plastid
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