系统中外围设备请求总线控制都是通过( )进行的。
A.NMI
B.INTE
C.INTR
D.HOLD
参考答案:D
解析:外围设备通过向CPU的HOLD发请求来获得总线控制权。
用适当的方法解下列方程:
(1)x2=49;
(2)(2x+3)2=4(2x+3);
(3)2x2+4x-3=0(公式法);
(4)(x+8)(x+1)=-12。
When you stayed in a rent room in that town last month, you _____ with my brother Tony. He lives alone
there. [ ]
A. must have stayed
B. could have stayed
C. shouldn't have stayed
D. need have stayed