单项选择题

下面的无向图中，能一笔画成的是( )。

A．只有a
B．b和c
C．只有c
D．没有
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单项选择题
There are two styles in the evolution of instruction set, that is CISC and RISC. Which chip belongs to the CISC ( )
A．SOAR
B．VAX-11/780
C．CDC6600
D．IBM RTPC
单项选择题
Which of the following statements is correct ( )
A．The definition phase results in the Software Requirements Specification
B．Testing is optional in software life cycle
C．CASE tools can only aid in the design phase of a software life cycle
D．A change during a later phase does not require the documentation of all earlier phases to be up-dated
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