Inside the computer, the operation system(of another software module called a data communication(71))must decide which program will get control next. Each program remember, is associated(72). a particular front -end port. If a program's data have not yet reached its front - end buffer, there is no point giving that program control. Thus the data communication monitor sends its own(73)signal to the front -end devices next port is polled. Note that the(74)computer speed. The computer never has to wait for a terminal or a communication line. Instead, it is the expressive front - end processor that waits for the slower system(75)to respond.

A．memory

B．control

C．monitor

D．charge

[单选题]controls the operation of the computer and performs its data processing functions．A．CPUB．DiskC．MemoryD．I/O

[单选题]controls the operation of the computer and performs it's data processing functions.A．CPUB．Hard diskC．MemoryD．Database system

[主观题]they are inside 选择_______________theirspacesuitsorthewallsoftheirspacecraft,iftheyareinside[A]but[B]because[C]so[D]for

[单选题]When adding oil to a refrigeration system, precautions must be taken to ensure thatA．the compressor suction pressure is not too highB．all air is purged from the pump and charging fittingsC．the high pressure cutout switch is held open to prevent accid

[单选题]A． ______ computer is a personal computer whose hardware is capable of using any or all of the following media in a program, text, graphics, video and animation.A．databaseB．multimediaC．networkD．mainframes

[单选题]（）is for the operation ordering and the information exchange by internet among the firms. A . order processingB . order makingC . Electronic order systemD . order form

[单选题]The program and the data are kept inside the computer in a place called______．A．busB．cacheC．CPUD．memory

[单选题]Successful combustion inside the cylinders of a diesel engine is dependent upon （）.A . fine atomizationB . high temperatureC . good mixing of fuel and airD . all of the above

[主观题]If an exception is thrown inside a catch block, will the finally block be still be called?(如果catch块捕获了一个异常,那么finally块还会被调用吗)

[单选题]In the experiment, the burning inside the bottle can___.A． equalize the air pressure inside and outsideB． make a seal in the neck of the bottleC． finish up the oxygen inside the bottleD． produce more oxygen inside the bottle