Listen to a news report and choose the best answer to each question.[音频][音频]
A. France was attacked by terrorists for the first time.
B. France is under a state of emergency after terrorist attacks.
C. Terrorists threatened to attack more public places in France.
D. Several Frenchmen were killed and injured in a terrorist attack.
查看答案
[音频]
A. To arrest the terrorists.
B. To seek international help.
C. To close public places on Saturday.
D. To call on French people to defeat the terrorists.
状态管理数据库把服务的状态数据推送到内存当中，从而提高数据库访问效率。
A. 对
B. 错
状态管理是一种存储设备，用来暂时地持久化软件程序的状态数据。
A. 对
B. 错
波源不动时，波源的振动周期与波的周期在数值上是不同的．
A. 对
B. 错
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