DBA是指实时地（ms级）改变PON中各ONU上下行带宽的机制，根据带宽状态和ONU需求动态（合理）分配ONU的上下行带宽。
参考答案：错
用所给单词的适当形式填空。
1. Do you enjoy _____ (stay) here?
2. She ______ (not have) supper at school every day.
3. Their ideas ______ (not sound) very good.
4. It's seven o'clock now. The children ______ (chat) in the sitting room.
5. It never ______ (snow) in winter in our hometown.
6. How about ______ (go) fishing in the afternoon?
7. Well, I'm going ______ (shop) on Saturday.
8. —What's she doing for vacation？
—She _____ (look) after her little sister.
接种疫苗后应在接种点停留观察（），无异常后再离开。
