在操作系统中引入并发可以提高系统效率。若有两个程序A和B，A程序执行时所做的工作按次序需要占用CPU：5秒，DEV1：5秒，CPU：10秒，DEV2：10秒，CPU：10秒；B程序执行时所作的工作按次序需要占用DEV1：10秒，CPU：10秒，DEV2：5秒，CPU：5秒，DEV2：10秒。若顺序执行A、B两个程序，则CPU的利用率为(18)；若在并发环境下执行这两个程序，假设A程序先执行，则CPU的利用率为(19)。
-
(58)
- A．error
- B．question
- C．tolerance
- D．problem
-
(57)
- A．manages
- B．manage
- C．managed
- D．managing
-
(55)
- A．earth
- B．bottom
- C．table
- D．surface
-
(56)
- A．graphics
- B．data
- C．text
- D．image
-
Applications put computers to practical business(67), but below the(68)it's the heart of an operating system-the kernel-that provides the technical wizardry to juggle multiple program, connect to networks and store(69).
- A traditional kernel provides all the functions for applications. The kernel(70)memory, I/0 devices and parcels out processor time. The kernel also supports security and fault(71), which is the ability to recover automatically when
- A．used
- B．use
- C．apply
- D．applied
-
In C language,(75) are used to create variables and are grouped at the top of a gram block.
- A．comments
- B．declarations
- C．descriptions
- D．dimensions
-
One important difference is that an ActiveX control must be(74) for a specific platform, while an applet is platform-independent.
- A．transactioned
- B．compiled
- C．created
- D．identitied
-
(73) is a channel's capacity which directly reflects the data transfer rate of the channel.
- A．The delay
- B．The volume
- C．The noise
- D．The bandwidth
-
DBMS will" manage "the stored data items and assemble the needed items from the(72) database in response to the queries of those who aren't programmers.
- A．particular
- B．the same
- C．common
- D．extention
-
On a(71) memory system, the logical memory space available to the program is totally independent of the physical memory space.
- A．cache
- B．EPROM
- C．virtual
- D．SRAM
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