（）机关根据执法需要，可以查阅公路收费监控系统信息。
A. 交通
B. 公安
C. 交通、公安
D. 城管
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You want to take a complete database backup using RMAN. The backup should consist onlythe used blocks from your database. Which two statements are true about this backup operation？（）
A. Backup compression should be enabled
B. Parallelism for the channel should be set to 2
C. All the files must be backed up as backup sets
D. The backup may be stored either on disk or on media with media manager
下列（）为导热热阻。
A. λ／（δ
B. δ／（λ
C. l／（α
D. l／（K
教师授课技巧的高低是影响培训效果的关键因素。
A. 正确
B. 错误
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