作业Jl,J2,J3,J4的提交时间和运行时间如下表所示。若采用短作业优先调度算法,则作业调度次序为(),平均周转时间为()分钟(这里不考虑操作系统的开销)。
A.J3→J4→J2→J1 B.J1→J2→J3→J4 C.J1→J3→J4→J2 D.J4→J3→J2→J1
单项选择题某数值编码为FFH,若它所表示的真值为-127,则它是用()表示的。
A.原码 B.反码 C.补码 D.移码
单项选择题On a()memory system,the logical memory space available to the program is totally independent of the physical memory space.
A.cache B.virtual C.RAM D.ROM
单项选择题A programmer must know about a function’s()to call it correctly.
A.location B.algorithm C.interface D.statements
单项选择题One solution to major security problem is(),which are frequently installed to fix known security holes.
A.patches B.compensations C.complements D.additions
单项选择题()is a clickable string or graphic that points to another Web page or document.
A.Link B.Anchor C.Browser D.Hyperlink
单项选择题In()programming, the user determines the sequence of instructions to be executed ,not the programmer.
A.top-down B.structure C.data-driven D.event-driven
单项选择题The standard()in C language contain many useful functions for input and output , string handing,mathematical computations,and system programming tasks.
A.database B.files C.libraries D.subroutine
单项选择题In C language,functions are important because they provide a way to()code so that a large complex program can be written by combining many smaller parts.
A.modify B.modularize C.block D.board
单项选择题Very long,complex expressions in program are difficult to write correctly and difficult to()
A.defend B.detect C.default D.debug
单项选择题The term “() program” means a program written in high-level language.
A.compiler B.executable C.source D.object