【单选题】【消耗次数：1】
广域网一般采用网状拓扑构型，该构型的系统可操性高，但是结构复杂。为了实现正确的传输必须采用（）。Ⅰ.光纤传输技术Ⅱ.路由选择算法Ⅲ.无线通信技术Ⅳ.流量控制方法
①
Ⅰ和Ⅱ
②
Ⅰ和Ⅲ
③
Ⅱ和Ⅳ
④
Ⅲ和Ⅳ
参考答案：
复制
纠错
相关题目
随机题目
【单选题】
ultimatum
①
the general opinion about the character, qualities etc
②
state of being in demand
③
sth. that provokes or annoys
④
final statement of conditions to be accepted
【单选题】
The Nazi regime is devoid ______ all theme and principle except appetite and racial domination.
①
of
②
away
③
from
④
for
【单选题】
I see the Russian soldiers standing on the ________ of their native land, guarding the fields.
①
threshold
②
frontiers
③
entrance
④
gate
【单选题】
In June 1941 Hitler suddenly launched an attack ______ Russia.
①
for
②
to
③
on
④
against
【单选题】
When I awoke on the morning of Sunday, the news was brought ______ me ______Hitler’s invasion of Russia.
①
for…of
②
to…on
③
to… of
④
for… on
【单选题】
Hitler was wrong and we should ______ to help Russia.
①
go out all@go all out
②
make out all
③
make all out
【单选题】
This is no time to moralize ______ the follies of countries which have allowed themselves to be struck down one by one.
①
to
②
on
③
by
④
in
【单选题】
Hitler was however wrong and we should ______ to help Russia.
①
make all out
②
make out all
③
go all out
④
go out all