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
单项选择题
常规软件生命周期不包括
A．可行性分析
B．需求分析
C．运行与维护
D．性能优化
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