单项选择题

（ ） Development is a structured design methodology that proceeds in a sequence from one phase to the next.

A．Waterfall
B．Phased
C．Prototyping
D．Parallel
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单项选择题
Since RAM is only active when the computer is on, your computer uses disk to store information even when the computer is off. Which of the following is true （ ）
A．When your computer is on, only RAM is used to store information.
B．When your computer is on, only disk drives are used to store information.
C．When your computer is off, only RAM is used to store information.
D．When your computer is off, only disk drives are used to store information.
单项选择题
Stack is quite simple. Many computer systems have stacks built into their circuitry.They also have machine-level instructions to operate the hardware stack. Stack is （ ） in computer systems.
A．useless
B．not important
C．simple but important
D．too simple to be useful
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