细菌形态通常有球状、杆状、螺丝状三类。自然界中杆菌最常见,球菌次之,螺旋菌最少。()
参考答案:对
阅读以下关于中断的叙述。
[说明]
在某嵌入式系统中,王工设计的计算机模块如图4-1所示。它要求CPU在执行完当前指令后转而对中断请求进行处理。假定:TDC为查询链中每个设备的延迟时间,Ta、Tb、Tc分别为设备A、B、C的中断服务程序所需的执行时间,TS和TR为保存现场和恢复现场所需的时间。
本系统不允许中断嵌套,如果CPU响应中断,则中断处理过程按照如下流程执行,将(1)~(5)的内容填入答题纸上相应的位置。
中断处理过程流程:
根据所给首字母填空。
My brother e 1 for half an hour every day. He s 2 for ten hours every night. He w 3 TV for
about an hour every day. He s 4 eats cakes, sweets and meat. He often e 5 fruit and v 6 . He
often w 7 to school. He h 8 lunch at school. After lunch, he s 9 for half an hour. Then he goes
on to study. He goes h 10 at five in the afternoon.