
【名词&注释】
计数器(counter)、优先级(priority)、保护模式(protected mode)
[单选题]在存储保护模式中,可分为: I.执行级(Executive),用E表示; Ⅱ.管理级(Supervisor),用S表示; Ⅲ.核心级(Kernel),用K表示; Ⅳ.用户级(User),用U表示。 其优先级从高到低的次序为______。
A. SKEU
B. SEUK
C. KSEU
D. KESU
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举一反三:
[单选题]TCP service is obtained by having both the sender and the receiver create end points,which are called
A. network address
B. supernet address
C. socket
D. IP address
[单选题]In which phase of the software engineering process is the Software Requirements Specification developed?
A. definition phase
B. engineering
C. maintenance
D. development phase
[多选题]假设8253计数器写入的控制字是36H,则8253被设置成
A. 选择计数器0
B. 先读/写高字节,再读/写低字节
C. 选择工作模式3
D. 方波发生器
E. 按BCD码方式计数
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