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【单选题】
利用虚电路方式传输数据时,首先进行的是( )
A.
虚电路拆除
B.
物理线路建立
C.
数据传输
D.
虚电路建立
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【单选题】通过透镜观察到一个放大的像，则物体应放在（　　）
A.
1倍焦距和2倍焦距之间
B.
1倍焦距之间
C.
2倍焦距之外
D.
2倍焦距处
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【多选题】Why is full-duplex Ethernet superior to its single-duplex counterpart? (Select two answer choices.)
A.
It uses inexpensive hubs
B.
It operates without collisions
C.
It operates on switches
D.
It provides faster data transfer
E.
It utilizes fewer wiring pairs
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【简答题】验电的步骤和要求是什么?
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【单选题】According to the bank clerk, the rate for buy is 625 today.
A.
T
B.
F
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【单选题】除氟可采用吸附过滤、混凝、电渗析、电解法等方法,我国应用最多的是( )。
A.
电解法
B.
混凝法
C.
电渗析
D.
吸附过滤
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【单选题】The bank clerk listened carefully he could discover exactly what the client wanted.
A.
in case that
B.
now that
C.
so that
D.
provided that
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【单选题】当大风停下了,孩子们又出来玩了。
A.
The winds  stopped, the children came out to play again.
B.
When the winds stopped, the children came out to play again.
C.
While the winds stopped, the children came out to play again.
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【多选题】Which of the following statements correctly describe the differences between half-duplex and full-duplex Ethernet?（）
A.
Full-duplex Ethernet uses CSMA/CD to prevent collisions.
B.
Half-duplex Ethernet uses a loopback circuit to detect collisions.
C.
A full-duplex Ethernet card allows 20Mbps for data transmission.
D.
Full-duplex Ethernet makes use of two pairs of wires for data.
E.
An Ethernet hub can operate both half and full duplex simultaneously.
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【多选题】When you compare the differences between half-duplex and full-duplex Ethernet, which of the following characteristics are exclusive to half-duplex? (Select two answer choices)
A.
Half-duplex Ethernet operates in a shared collision domain.
B.
Half-duplex Ethernet operates in an exclusive broadcast domain.
C.
Half-duplex Ethernet has efficient throughput.
D.
Half-duplex Ethernet has lower effective throughput.
E.
Half-duplex Ethernet operates in an exclusive collision domain.
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【单选题】In Ethernet networks, duplex mismatches will lower performance. Which error statistics can be seen if a duplex mismatch is present?（）
A.
collisions on the full-duplex side; runts on the half-duplex side
B.
collisions on the full-duplex side; collisions on the half-duplex side
C.
collisions on the half-duplex side; framing errors on the full-duplex side
D.
collisions on the half-duplex side; giants on the full-duplex side
查看完整题目与答案
相关题目：
【单选题】通过透镜观察到一个放大的像，则物体应放在（　　）
A.
1倍焦距和2倍焦距之间
B.
1倍焦距之间
C.
2倍焦距之外
D.
2倍焦距处
查看完整题目与答案
【多选题】Why is full-duplex Ethernet superior to its single-duplex counterpart? (Select two answer choices.)
A.
It uses inexpensive hubs
B.
It operates without collisions
C.
It operates on switches
D.
It provides faster data transfer
E.
It utilizes fewer wiring pairs
查看完整题目与答案
【简答题】验电的步骤和要求是什么?
查看完整题目与答案
【单选题】According to the bank clerk, the rate for buy is 625 today.
A.
T
B.
F
查看完整题目与答案
【单选题】除氟可采用吸附过滤、混凝、电渗析、电解法等方法,我国应用最多的是( )。
A.
电解法
B.
混凝法
C.
电渗析
D.
吸附过滤
查看完整题目与答案
【单选题】The bank clerk listened carefully he could discover exactly what the client wanted.
A.
in case that
B.
now that
C.
so that
D.
provided that
查看完整题目与答案
【单选题】当大风停下了,孩子们又出来玩了。
A.
The winds  stopped, the children came out to play again.
B.
When the winds stopped, the children came out to play again.
C.
While the winds stopped, the children came out to play again.
查看完整题目与答案
【多选题】Which of the following statements correctly describe the differences between half-duplex and full-duplex Ethernet?（）
A.
Full-duplex Ethernet uses CSMA/CD to prevent collisions.
B.
Half-duplex Ethernet uses a loopback circuit to detect collisions.
C.
A full-duplex Ethernet card allows 20Mbps for data transmission.
D.
Full-duplex Ethernet makes use of two pairs of wires for data.
E.
An Ethernet hub can operate both half and full duplex simultaneously.
查看完整题目与答案
【多选题】When you compare the differences between half-duplex and full-duplex Ethernet, which of the following characteristics are exclusive to half-duplex? (Select two answer choices)
A.
Half-duplex Ethernet operates in a shared collision domain.
B.
Half-duplex Ethernet operates in an exclusive broadcast domain.
C.
Half-duplex Ethernet has efficient throughput.
D.
Half-duplex Ethernet has lower effective throughput.
E.
Half-duplex Ethernet operates in an exclusive collision domain.
查看完整题目与答案
【单选题】In Ethernet networks, duplex mismatches will lower performance. Which error statistics can be seen if a duplex mismatch is present?（）
A.
collisions on the full-duplex side; runts on the half-duplex side
B.
collisions on the full-duplex side; collisions on the half-duplex side
C.
collisions on the half-duplex side; framing errors on the full-duplex side
D.
collisions on the half-duplex side; giants on the full-duplex side
查看完整题目与答案