With reference to a two ram actuating mechanism, which one of the following statement is false?（）

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  A . 2001：DB8：：1 and 2001：DB8：：2 B . 2001：DB8：：9 and 2001：DB8：：10 C . 2001：DB8：：10 and 2001：DB8：：17 D . 2001：DB8：：1 and 2001：DB8：：18

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• Refer to the exhibit.Switch-1 needs to send data to a host with a MAC address of 00b0.d056.efa4.What will Switch-1 do with this data?（）https://assets.asklib.com/images/image2/2018072316493495987.jpg

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• With reference to operating a four-ram steering gear system under emergency conditions, which one of the following statements is incorrect?（）

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• A vessel moored with two anchors,sometimes, at an exposed roadstead to（）.

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• Which two addresses can be assigned to a host with a subnet mask of 255.255.254.0？（）

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• A vessel moored with two anchors，sometimes，at an exposed roadstead to（）.

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