欲使图2-2中地址译码器的输入信号有效,其中的控制信号AEN和IOR必须分别取值为——, ______。
参考答案:0,1
解析: (略)
___ fishes are usually more expensive than ___ ones, because it's not easy to keep them ____. [ ]
A. Alive; frozen; live
B. Living; freezing; live
C. Live; freezing; living
D. Live; frozen; alive
键盘上的控制键是()。