在鼓风机后的焦炉煤气系统，应设泄爆装置，设自动的连续式氧含量分析仪，煤气含氧量达（）时报警，达（）时切断电源。
A. 0.6%，1%
B. 1%，2%
C. 2%，5%
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You have a file server named Server1 that runs Windows Server 2003 Service Pack 2 (SP2).You need to implement a backup schedule on Server1 to meet the following requirements:·Everyday, back up all files and folders to disk.·Every Friday, back up all files and folders to tape.·Every Sunday, Tuesday, and Thursday, back up only the files and folders that have changed since theprevious Friday’s backup to tape.Which backup jobs should you create?（）
A. ·a normal backup to disk everyday ·a normal backup to tape on Friday ·a differential backup to tape on Sunday, Tuesday, and Thursday
B. ·a normal backup to disk everyday ·a normal backup to tape on Friday ·an incremental backup to tape on Sunday, Tuesday, and Thursday
C. ·a copy backup to disk everyday ·a normal backup to tape on Friday ·a differential backup to tape on Sunday, Tuesday and, Thursday
D. ·a copy backup to disk everyday ·a normal backup to tape on Friday ·an incremental backup to tape on Sunday, Tuesday and, Thursday
来源于豆科的药材是（）
A. 棕儿茶、甘草、黄芪、苦参
B. 北豆根、鸡血藤、葛根、槐米
C. 番泻叶、北豆根、苏木、槐花
D. 山豆根、大血藤、黑儿茶、番泻叶
E. 决明子、补骨脂、沙苑子、黑儿茶
炉凉时可适当减风，以控制料速，提高炉温。
A. 正确
B. 错误
接触网应满足在恶劣的气候条件下机械结构具有良好稳定性的基本要求。
A. 正确
B. 错误
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