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【多选题】
下列关于钢筋混凝土结构用钢材的相关说法中，错误的是（）。A.
根据表面特征不同，热轧钢筋分为光圆钢筋和带肋钢筋两大类
B.
热轧光圆钢筋的塑性及焊接性能很好，但强度较低，故HPB300广泛用于钢筋混凝土结构的构造筋
C.
钢丝按外形分为光圆钢丝、螺旋肋钢丝、刻痕钢丝三种
D.
预应力钢绞线主要用于桥梁、吊车梁、大跨度屋架和管桩等预应力钢筋混凝土构件中
E.
预应力钢丝主要用于大跨度、大负荷的桥梁、电杆、轨枕、屋架、大跨度吊车梁等结构
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【简答题】data recovery
【多选题】Identify two situations in which you can use Data Recovery Advisor for recovery. （）(Choose two.)
A.
The user has dropped an important table that needs to be recovered.
B.
The database files are corrupted when the database is open.
C.
You are not able to start up the database instance because the required database files are missing.
D.
The archived log files are missing for which backup is not available.
【多选题】Which two activities are NOT supported by the Data Recovery Advisor?（）
A.
Diagnose and repair a data file corruption offline.
B.
Diagnose and repair a data file corruption online.
C.
Diagnose and repair failures on a standby database.
D.
Recover from failures in the Real Application Cluster (RAC) environment.
【单选题】______ it ______ for your help, I couldn’t have made any progress.
A.
Had; not been
B.
Should; not been
C.
Did; not been
D.
Not; been
【多选题】Which three activities are supported by the Data Recovery Advisor?（）
A.
Advising on block checksum failures
B.
Advising on inaccessible control files
C.
Advising on inaccessible block change tracking files
D.
Advising on empty password files
E.
Advising on invalid block header field values
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