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【单选题】
在SNMP的管理模型中,关于管理信息库的说法正确的是( )。A.
一个网络只有一个信息库
B.
管理信息库是一个完整、单一的数据库
C.
管理信息库是一个逻辑数据库，它由各个代理之上的本地信息库联合构成
D.
以上三种说法都不对
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【单选题】I like this 3G cellphone very much, but it costs almost _______that one.
A.
four times as many as
B.
as four times many as
C.
four times as much as
D.
as four times much as
【单选题】A commonly used rule of thumb is that it costs approximately ____ times as much to get a new customer as it does to keep an existing customer.
A.
three
B.
four
C.
five
D.
six
【单选题】I like this 5G cellphone very much, but it costs almost _______that one.
A.
four times as many as
B.
as four times many as
C.
four times as much as
D.
as four times much as
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