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【单选题】
关于OSPF的区域划分描述正确的是（ ）A.
OSPF的区域边界在链路上
B.
OSPF在广播网中，所有路由器都会形成邻接关系
C.
一般情况下，OSPF所有非骨干区必须和骨干区相连
D.
区域边界路由器可以是一台内部路由器
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皮皮学刷刷变学霸
举一反三
【单选题】It was the young scientist ___ solved this problem five years ago.
A.
who
B.
whom
C.
which
D.
Both A and C
【简答题】This famous scientist ________________ at home by his mother when he was young.
【简答题】A young man asked Albert Einstein, the great German scientist , what the secret of success is. The scientist told him that the secret of success is hard work. A few days later the young man asked the ...
【单选题】This young scientist is not only intelligent ________ hardworking.
A.
and
B.
but
C.
also
D.
so
【简答题】打开 part4\ 练习 1 素材 .bmp 文件,如图 4-58 所示。使用 Photoshop 提供的工具对人像素材进行修饰。
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