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【多选题】
一位同事问您，在为网络上的主机分配TCP/IP地址时，最重要的因素是什么他对影响子网掩码的因素特点感兴趣那么，在定义子网掩码时，应该考虑的最重要的因素是下列哪一些（）A.
网络中默认网关的数目
B.
每个网段中主机的数目
C.
域控制器所使用的操作系统
D.
网络的数目
手机使用
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反馈参考答案：
举一反三
【单选题】Which of the following sentences indicates permission?
A.
Lightening can be dangerous.
B.
Anyone can enroll for this course.
C.
You could have known the truth.
D.
May you succeed.
【单选题】Which of the following may be used in cleaning up an oil spill without the permission of governmental authorities ________．
A.
Straw and Skimmers only
B.
Skimmers and Chemical dispersants only
C.
Straw and Chemical dispersants only
D.
Straw，Skimmers and Chemical dispersants
【单选题】Which of the following sentences expresses a PERMISSION?
A.
You can't park here.
B.
I can't finish the task in a week.
C.
He couldn't have been hurt.
D.
Where can he have gone?
【判断题】The written permission granted by the customs authorities to allow the vessel which has brought any imports or has loaded exports to leave the port is Entry Inwards. ( )
A.
正确
B.
错误
【单选题】Which login class permission will allow a user to use the telnet utility?（）
A.
network permission
B.
maintenance permission
C.
supervisor permission
D.
shell permission
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