图示电路，利用电源等效变换，计算ＡＢ间短路时的电流Ｉ＝？ A A、 B、 C、 D、……

未分类题What is the author's attitude towards The Grand Prairie Area Demonstration Project?A.Be optimistic to support this project.B.Became an opponent to those gaining unfair wealth from this project.C.Be objective to treat this problem.D.Be indifferent to this issuE.

单项选择题利用Navicate的生成的备份文件，可以利用mysqldump命令进行恢复。

未分类题What's the evidence that Jackson thought Kobe is better than Michael?A.Kobe is doing less post-up, less penetration, less at-the-basket kind of stufF.B.Kobe is shooting more than Michael was.C.Kobe's shooting way is raising up over people and knocking the ball down.D.Kobe can shoot in more range than Michael.

单项选择题mysqldump是采用SQL级别的备份机制，它将数据表导成SQL脚本文件。

单项选择题冷备份的优点是在大多数情况下数据库可在工作时恢复。