根据《建筑施工竹脚手架安全技术规范》（第5.4.1条），满堂脚手架搭设（）
A. 高度不得超过15m
B. 加提高宽比不得小于3m
C. 当设置连墙件时，高宽比可不受限制
D. 满堂脚手架可由立杆、水平杆、斜杆、剪刀撑、连墙件、扫地杆等组成
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You issue the following RMAN command to set a retention policy on a database： RMAN>CONFIGURE RETENTION POLICY TO REDUNDANCY 2； What will be the outcome of the above command？（）
After two days， the backup will be marked obsolete.
B. After two days， the backup will be deleted from the media.
C. If the RMAN repository has records of two or more recent backups of a file， then the older backup will be deleted from the media.
D. If the RMAN repository has records of two or more recent backups of a file， then the older backup will be marked obsolete.
变压器室的大门一般按变压器外形尺寸加（）。
A. 0.5m
B. 0.6m
C. 0.7m
D. 0.8m
气态制冷剂在冷凝器中的凝结液化过程是定温定压过程。
A. 正确
B. 错误
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