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【单选题】
设变压器次级电压有效值为 U 2 ,在单相桥式整流电路中,负载电阻 R L 上输出电压的平均值为( )A.
0.45U 2
B.
0.9 U 2
C.
1.2U 2
D.
U 2
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举一反三
【多选题】Which two are true concerning a multitenant container database with three pluggable database?（）
A.
All administration tasks must be done to a specific pluggable database.
B.
The pluggable databases increase patching time.
C.
The pluggable databases reduce administration effort.
D.
The pluggable databases are patched together.
E.
Pluggable databases are only used for database consolidation.
【单选题】Which statement is true about a whole consistent database backup on a database running in ARCHIVELOGmode（）
A.
The backup will consist of used data blocks only.
B.
The database must be shut down to accomplish the backup.
C.
The backup can be accomplished without shutting down the database.
D.
The backup will contain all database files that have never been backed up
【简答题】体外链接 DNA 片段的方法有哪些?
【简答题】证明 e(φ)×e1(φ)=k； (2)证明 e(φ+α)=e(φ)cos α+e1(φ)sin α．
【单选题】Which type of database architecture does Oracle use?
A.
network database
B.
relational database
C.
hierarchical database
D.
object-oriented database
【单选题】I would rather apologize to my boss for being late without an explanation than ______ an excuse.
A.
fabricate
B.
fake
C.
forge
D.
pretend
【简答题】已知A(r，θ，φ)=r 2 sinφe r +2rcosθe θ +sinθe φ ，求 ． (ρ，φ，z)为柱面坐标，(r，θ，φ)为球面坐标．
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