问题
单项选择题
下面关于8237可编程DMA控制器的叙述中，错误的是( )。
A．8237有4个DMA通道
B．8237的数据线为16位
C．每个通道有硬件DMA请求和软件DMA请求两种方式
D．每个通道在每次DMA传输后，其当前地址寄存器的值自动加1或减1
答案
参考答案：B
搜题请搜索小程序“爱下问搜题”
下面关于8237可编程DMA控制器的叙述中，错误的是( )。
A．8237有4个DMA通道
B．8237的数据线为16位
C．每个通道有硬件DMA请求和软件DMA请求两种方式
D．每个通道在每次DMA传输后，其当前地址寄存器的值自动加1或减1
参考答案：B
Jack arrived in a big city of China. When he got off the train, he felt very hungry (饥饿的） and wanted to ___1___some food. But he didn’t know___2___to get to a food shop, so he bought a___3___of the city. Jack read the map carefully. Then he walked along Heping Street and ___4___right when he saw the traffic lights. But he was___5___ . He didn’t find any food shops there! Jack went to ask a policeman___6___help. He couldn’t speak any Chinese, so he ___7___ a piece of paper and drew a food shop on it. The policeman was___8___and he knew what Jack wanted to do. He told Jack to go___9___the bridge and then walk on for about ___10___The food shop was next to a big hospital. Jack found the food shop at last.
|