单项选择题

Which is local to a thread instead of a process

A．a staCk
B．an open file
C．a semaphore
D．an address space

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单项选择题

In the following statements about functional dependency, which one is incorrect

A．If X→Y and Y→Z, then X→
B．If X→Y and Y'

Y, then X→Y'.
C．If X→Y and X'

X, then X'→
D．If X'

X, then X→X'.

单项选择题

Each Cell of Asynchronous Transfer Mode (ATM) has fix length. How long is it

A．50B
B．51B
C．52B
D．53B

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