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股票发行采用代销方式，代销期限届满，向投资者出售的股票数量未达到拟公开发行股票数量80%的，为发行失败。 ()

A. 正确
B. 错误

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在政府采购合同履行中，采购人需追加与合同标的相同的货物、工程或者服务的，在不改变合同其他条款的前提下，可以与供应商协商签订补充合同，但所有补充合同的采购金额不得超过原合同采购金额的20% 。 ()

A. 正确
B. 错误

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A．beforeB．afterC．onceD．while

A. before
B. after
C. once
D. while

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You are a senior network administrator at Ezonexam, and while performing the password recovery procedure on your 2500 series Cisco router, you type in the following command:
o/r 0x2142
What is the purpose of this command？

A. It is used to restart the router.
B. It is used to bypass the configuration in NVRAM.
C. It is used to enter ROM Monitor mode.
D. It is used to view the lost password.
E. It is used to save the changes to the configuration.

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The network administrator has configured port security on a Ezonexam switch. Why would a network administrator configure port security on this Ezonexam device？

A. To prevent unauthorized hosts from getting access to the LAN
B. To limit the number of Layer 2 broadcasts on a particular switch port
C. To prevent unauthorized Telnet or SSH access to a switch port
D. To prevent the IP and MAC address of the switch and associated ports
E. None of the above

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股票发行采用代销方式，代销期限届满，向投资者出售的股票数量未达到拟公开发行股票数量80%的，为发行失败。 ()

A. 正确 B. 错误

在政府采购合同履行中，采购人需追加与合同标的相同的货物、工程或者服务的，在不改变合同其他条款的前提下，可以与供应商协商签订补充合同，但所有补充合同的采购金额不得超过原合同采购金额的20% 。 ()

A．beforeB．afterC．onceD．while

You are a senior network administrator at Ezonexam, and while performing the password recovery procedure on your 2500 series Cisco router, you type in the following command:o/r 0x2142What is the purpose of this command？

The network administrator has configured port security on a Ezonexam switch. Why would a network administrator configure port security on this Ezonexam device？

A. 正确
B. 错误

You are a senior network administrator at Ezonexam, and while performing the password recovery procedure on your 2500 series Cisco router, you type in the following command:
o/r 0x2142
What is the purpose of this command？