You are using the control file to maintain information about the database backups that are being performed by Recovery Manager (RMAN).Identify two scenarios is which you must have a recovery catalog. （）(Choose two.)
A. To store the backup information of multiple database
B. To restrict the amount of space that is used by the backups
C. To maintain a backup for a certain time is set by the CONTROL_FILE_RECORD_KEEP_TIME parameter.
D. To list the data files that were in a target database at a given time by using the AT option of REPORT SCHEMA command.
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二极管的最高反向电压为击穿电压的（）。
A. 1/2
B. 1/3
C. 2/3
D. 1/5
架空乘人装置运行速度不应超过1.2m/s的抱索器是（）
A. 可摘挂抱索器
B. 活动抱索器
C. 自行摘挂抱索器
D. 自动摘挂抱索器
E. 固定抱索器
男性，20岁。1个月前在运动时上腹部曾被撞伤，当时未加注意。4天前自觉上腹部肿块，伴上腹部胀痛，恶心，呕吐。体查：体温37.3℃，腹平软，中上腹偏左可扪及15cm×18cm肿块，光滑，固定，有压痛。B超示左上腹囊性肿块。目前诊断为胰腺假性囊肿。治疗的最适宜时机是（）。
A. 立即手术
B. 1个月后手术
C. 3个月后手术
D. 1年后手术
E. 不手术，自行吸收
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