问题
单项选择题
在IBM-PC/XT微机系统主板上的8237A控制器，可以提供给用户使用的DMA通道是( )
A．通道0
B．通道1
C．通道2
D．通道3
答案
参考答案：B
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在IBM-PC/XT微机系统主板上的8237A控制器，可以提供给用户使用的DMA通道是( )
A．通道0
B．通道1
C．通道2
D．通道3
参考答案：B
| 阅读理解。 | ||||
No. 1
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| 根据前面广告的内容及以下各题中所给提示，选择正确答案。 | ||||
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1. Susan doesn't want to rent th e house because _____. | ||||
| A. it's too old B. it's too expensive C. there is only one bedroom D. it's too noisy | ||||
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| 3. How long will it take the children to learn to swim in the Centre? | ||||
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