There have been（）periods in the development of American political parties in the United States...

第1题

[单选题] （）during the voyage any case or suspected case of plague，cholera，yellow fever，smallpox，typhus or relapsing fever?

A、Has there been B、Have there been C、Has there D、Have there

第2题

[多选题] You have a class B network with a 255.255.255.0 mask. Which of the statements below are true of this network?（）

A、There are 254 usable subnets. B、There are 256 usable hosts per subnet. C、There are 50 usable subnets. D、There are 254 usable hosts per subnet. E、There are 24 usable hosts per subnet. F、There is one usable network.

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第3题

[单选题] You have been asked to use a 23-bit network mask to segment the network block 209.18.12.0, How many usable host address will there e per subnet?（）

A、510 B、1022 C、2046 D、8190

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第4题

[单选题] You have been asked to use a 23-bit network mask to segment the network block 209.18.12.0, How many usable host address will there e per subnet?（）

A、510 B、1022 C、2046 D、8190

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第5题

[单选题] You have been asked to use a 23-bit network mask to segment the network block 209.18.12.0.How many usable host addresses will there be per subnet?（）

A、510 B、1022 C、2046 D、8190

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第6题

[单选题] You have been asked to use a 23-bit network mask to segment the network block 209.18.12.0. How many usable host addresses will there be per subnet?（）

A、510 B、1022 C、2046 D、8190

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第7题

[单选题] You have been asked to use a 25 bit subnet mask to segment the following network block: 209.18.12.0. How many usable will there be per subnet?（）

A、2 hosts B、120 hosts C、126 hosts D、255 hosts

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第8题

[单选题] （）so many people in the United States been out of work as today.

A、More than ever before B、In the past, there have never C、Never before have D、Formerly, there never were

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第9题

[单选题] The work（）by the time you get there.

A、will have been done B、was done C、had been done D、has done

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第10题

[] （）any person died on board during the voyage otherwise than as a result of accident?

A、A.Have B、B.Has C、C.Has there been D、D.Are there

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There have been（）periods in the development of American political parties in the United States.

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