使用什么工具时，配合Shift键盘，可以限定套索移动方向只能是垂直、水平或者45度？（） 多边形套索工具。 套索工具。 磁性套索工具。
干式净化装置
在文件系统中，存取数据的基本*单位为（），在数据库系统中，存取数据的基本*单位为（）。
侦查终结的条件是（） 犯罪事实清楚。 犯罪性质和罪名认定正确。 证据确实充分。 法律手续完备。
You are a network administrator for your company. The design team provides you with the following list of requirements for server disaster recovery： No more than two sets of tapes can be used to restore to the previous day. A full backup of each server must be stored off-site. A full backup of each server that is no more than one week old must be available on-site. Backups must never run during business hours. Tapes may be recalled from off-site storage only if the on-site tapes are corrupted or damaged. A full backup of all servers requires approximately 24 hours. Backing up all files that change during one week requires approximately 4 hours. Business hours for the company are Monday through Friday， from 6：00 A.M. to 10：00 P.M. You need to provide a backup rotation plan that meets the design team’s requirements. Which two actions should you include in your plan？（） Perform a full normal backup for on-site storage on Friday night after business hours. Perform a full copy backup for off-site storage on Saturday night after the Friday backup is complete.。 Perform a full normal backup for on-site storage on Friday night after business hours. Perform another full normal backup for off-site storage on Saturday night after the Friday backup is complete.。 Perform a full copy backup for on-site storage on Friday night after business hours. Perform a full copy backup for off-site storage on Saturday night after the Friday backup is complete.。 Perform differential backups on Sunday， Monday， Tuesday， Wednesday， and Thursday nights after business hours.。 Perform incremental backups on Sunday， Monday， Tuesday， Wednesday， and Thursday nights after business hours.。 Perform incremental backups on Sunday， Tuesday， and Thursday nights after business hours. Perform differential backups on Monday and Wednesday nights after business hours.。
With regard to bridges and switches, which of the following statements are true?（）
