单项选择题

Which function is used to lock a file in FoxPro DBMS

A．FLOCK( )
B．RLOCK( )
C．LOCK( )
D．LOCK
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单项选择题
异步传输模式ATM中每个信元的长度是
A．37字节
B．39字节
C．41字节
D．53字节
单项选择题
Which function is NOT served by building a prototype
A．It takes the place of the final syste
B．It assists in gathering software requirement
C．It assists in estimating the cost of the projec
D．It is used as the foundation of the larger project
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