单项选择题

N-S diagram can used to substitute conventional program flow Chart．In the following phrases，Which does not belong to the basic control structures that contain

A．sequence structure
B．condition Structure
C．selection structure
D．execution structure
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单项选择题
计算机系统中，内存通常分为物理内存和
A．逻辑内存
B．缓冲内存
C．实际内存
D．高速内存
单项选择题
Which OSI layer does a Router operate at
A．the Physical Layer
B．the Data Link Layer
C．the Transfer Layer
D．the Network Layer
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