OSPF NSSA区域与STUB区域的区别是NSSA区域中可以引入路由。但是NSSA区域不会出现第五类LSA
参考答案：对
"Must I return the book this morning?" "
No, you _____. But you _____ to return it before next Monday." [ ]
A. needn't, must
B. mustn't, can
C. mustn't, may
D. needn't, need
“风在吼，马在叫，黄河在咆哮„„”这首著名抗战歌曲的曲作者是（）。
A.聂耳
B.冼星海
C.田汉
