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单选题
（）the time of collision，the 3rd officer was on the bridge．
A
At
B
On
C
Of
D
In
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单选题On a half-duplex Ethernet LAN, two hosts attempt to send data simultaneously,resulting in a collision. Following this collision, what will the hosts do?（）A
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单选题At the same time，it is（）for you to signify your acknowledgement of the responsibility for the collision by signing the copies of this letter hereto attached and to return me two copies in due time.A
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importantC
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