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问题 单项选择题

在操作系统中，虚拟输入/输出设备通常采用 （46） 来实现。

A．Spooling 技术，利用磁带

B．Spooling 技术，利用磁盘

C．脱机批处理技术，利用磁盘

D．通道技术，利用磁带

答案

参考答案：B

多项选择题

热风循环烤房可以是立式火炉．也可以是蜂窝煤火炉，其技术的核心是增设（）．增加烟叶问隙风速．减小烤房上下层间温湿度差．

A.立武火炉

B.蜂窝煤炉

C.风机和空气循环系统

D.风机和回风管等
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单项选择题

Some of the keys have a special use. There are referred to as command keys. The 3 most common are the Control or (66) , Alternate or (67) and the Shift keys though there can be more (the Windows key for example or the Command key). Each key on a standard keyboard has one or two characters. Press the key to get the lower character and hold Shift to get the upper. Disk Drives - All (68) need a drive to get information off - or (69) - and put information on the disk - or (70) . Each drive is designed for a specific type of disk whether it is a CD, DVD, hard disk or floppy. Often the term ’disk’and ’drive’are used to describe the same thing but it helps to understand that the disk is the storage device which contains computer files-or software - and the drive is the mechanism that runs the disk.

A．sets

B．dishes

C．disks

D．panels
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