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【单选题】
IP地址的地理顶级域名一中国为____。A.
US
B.
COM
C.
CN
D.
TW
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A.
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B.
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C.
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D.
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【单选题】Text 3 In recent years, railroads have been combining with each other, mergingsintossuper systems, causing heightened concerns about monopoly. As recently as 1995,the top four railroads accounted for ...
A.
cost reduction is based on competition.
B.
services call for cross-trade coordination.
C.
outside competitors will continue to exist.
D.
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