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【单选题】

There are 3 steps to confirm whether a range of IP address can be summarized. When of thefollowing is used in each of these 3 steps？（）

A、 The first number in the contiguous block of addresses

B、 The last number in the contiguous block of addresses

C、 The size of the contiguous block of addresses

D、 The subnet mask of the original network address

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第2题
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第3题
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第4题
[判断题] If the instructions are D/P the importer’s bank will release the documents to the importer only against payment.

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第6题
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第7题
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第8题
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第9题
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第10题
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