单项选择题
在数据库的概念设计中,最常用的数据模型是
A.形象模型
B.物理模型
C.逻辑模型
D.实体联系模型
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单项选择题
The most commonly used locking level in implementing concurrency control is at which of the following levels
A.database
B.table
C.record
D.field
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单项选择题
Suppose a given binary tree has 10 left nodes,then the number of nodes with degree of 2 is
A.12
B.11
C.9
D.Indeterminable
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