8086系统中内存储器的地址空间为1M，而在进行I/O读写时，I/O端口的地址空间为（）。
A.64M
B.1M
C.64K
D.1K
参考答案：C
A group of store managers must assemble 280 displays for an upcoming sale. If they assemble 25 percent of the displays during the first hour and 40 percent of the remaining displays during the second hour, how many of the displays will not have been assembled by the end of the second hour ？（）
A.70
B.98
C.126
D.168
E.182
机械图样所采用的投影法为()
A．中心投影法
B．斜投影法
C．正投影法
D．正投影法、中心投影法、斜投影法均可采用
