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若CPU要执行的指令为:MOV R1,#45(即将数值45传送到寄存器R1中),则该指令中采用的寻址方式为()。
A.直接寻址和立即寻址
B.寄存器寻址和立即寻址
C.相对寻址和直接寻址
D.寄存器间接寻址和直接寻址
表达式"(a+b)* (c-d)"的后缀表示为 ( ) 。
A、ab+cd-*
B、abcd+ -*
C、ab+*cd-
D、abcd*+ -
相联存储器按()访问。
A.地址
B.先入后出的方式
C.内容
D.先入先出的方式
At a basic level, cloud computing is simply a means of delivering IT resources as (1). Almost all IT resources can be delivered as a cloud service: applications, compute power, storage capacity, networking, programming tools, even communication services and collaboration (2). Cloud computing began as large-scale Internet service providers such as Google, Amazon, and others built out their infrastructure. An architecture emerged: massively scaled, (3)distributed system resources, abstracted a
第52题: 若关系 R 、 S 如下图所示,则关系代数表达式π1,3,7(σ3<6(R×S))与()等价
A. A
B. B
C. C
D. D