在数字信号脉冲编码方案中,全宽码又称为不归零码,包括()和()两种。
参考答案:单极性不归零码;双极性不归零码
根据首字母或汉语写出单词, 使句子意思完整。
1. The fifth day of a week is T_______.
2. She often c_______with her classmates about her school things.
3. I always get many nice p_______from my classmates on my birthday.
4. —How many d_______are there in a week?
—Seven.
5. You can find some i_______about Apple iphone 5 on the Internet.
6. Students should get everything _______(准备好的) for each class.
7. Look! Some young girls are playing _______(排球).
8. This pair of _______(运动)shoes is Kitty’s cousin’s.
9. The question is too _______(困难)for me, I can’t answer it.
10. We can get books from the school _______(图书馆).
AA级学校校讯通业务中断修复时限为().
A、小于4小时
B、小于16小时
C、小于8小时
D、小于20小时