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【单选题】
依靠单纯扩散通过细胞膜的物质是A.
氨基酸
B.
蛋白质
C.
葡萄糖
D.
Na+ 、 K+ 、 Ca2+ 等离子
E.
O 2 、 CO 2 、 N 2 、尿素、乙醇
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反馈参考答案：
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
【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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