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Even though this area is known( 1 )backward in terms of civilization, it will become an example of rapid development.

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The designer, with whom I have been working since 1999, has played a key role( 1 )shaping my views of the work.

The Titanic disaster led to a number of investigations in Great Britain and the United States that resulted( 1 )sweeping changes in maritime (海事的) safety law and ship construction.

在计算机网络中,( )拓扑结构使用集线器或交换机。

A. 总线型
B. 环形
C. 星型
D. 以上全是

IPV4中IP地址的长度是( )位二进制数。

A. 4
B. 8
C. 16
D. 32

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