【单选题】【消耗次数：1】
有关电子邮件代理，描述不正确的是( )
①
SMTP是一种“存储转发”协议，适合于进行代理
②
SMTP代理可以运行在堡垒主机上
③
内部邮件服务器通过SMTP服务，可直接访问外部因特网邮件服务器，而不必经过堡垒主机
④
在堡垒主机上运行代理服务器时，将所有发往这个域的内部主机的邮件先引导到堡垒主机上
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相关题目
【单选题】
在堡垒主机上，我们需要关闭或保留一些服务，以下做法中哪个是错误的：
①
如果我们不需要该服务，则将它关闭
②
如果我们不了解该服务的功能，可将其打开
③
如果我们将该服务关闭后引起系统运行问题，则再将它打
④
应该保留一些让堡垒主机提供给内部网用户的服务，如：Telnet、FTP服务
【单选题】
关于堡垒主机的说法，错误的是：
①
设计和构筑堡垒主机时应使堡垒主机尽可能简单
②
堡垒主机的速度应尽可能快
③
堡垒主机上应保留尽可能少的用户帐户，甚至禁用一切用户帐户
④
堡垒主机的操作系统可以选用UNIX系统
随机题目
【单选题】
, the sales manager began his report with the statistics of last month’s sales.
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By now
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As usual
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So far
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At most
【单选题】
Can I help you with your suitcase?
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I have no idea
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No, no. I can carry it myself
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That’s a good idea
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Thank you. I can manage myself
【单选题】
Please call us for more information as our website is currently construction.
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under
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by
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of
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with
【单选题】
They talked in whispers, but still, I couldn’t help but __________ their conversation.
①
overhear
②
to overhear
③
overhearing
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overheard
【单选题】
Oh, I’m sorry. But I promise I’ll be careful next time.
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It’s nothing at all
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Oh, never min
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It doesn’t matter
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Thank you
⑤
There are no questions
【单选题】
Not only are cars involved in most of the traffic accidents, but they also __________to the pollution of the air. .
①
contribute
②
promote
③
refer
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matter
【单选题】
She was __________ a very affectionate person.
①
at heart
②
in person
③
on purpose
④
by nature
【单选题】
The furniture in his room is quite different __________ in yours.
①
from those
②
from that
③
from that one
④
from those ones
【单选题】
Isn’t it about the time you __________ to do morning exercises?
①
began
②
begin
③
should begin
④
have begun