问题
单项选择题
已知某PC机系统的存储器由三个芯片组组成，每个芯片组容量为4K字节，总容量为12K字节，为满足其编址范围，至少需要地址总线中的______根。 ( )
A．15
B．14
C．13
D．12
答案
参考答案：B
解析： 13根地址总线可以寻址8K范围，不能满足12K的芯片组，所以至少需要 14根地址线，它的寻址范围是16K。
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已知某PC机系统的存储器由三个芯片组组成，每个芯片组容量为4K字节，总容量为12K字节，为满足其编址范围，至少需要地址总线中的______根。 ( )
A．15
B．14
C．13
D．12
参考答案：B
解析： 13根地址总线可以寻址8K范围，不能满足12K的芯片组，所以至少需要 14根地址线，它的寻址范围是16K。
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| It all started a year before when my daughter Suzanne and I were shopping in Sydney. In the window of a sports shop I noticed a photo of a group of young people climbing the rock 1 in a canyon (峡谷). "That's what I'm going to do next 2 ," I said. Suzanne laughed. "Sure, Mum! Don't forget you're 65 years old!" I didn't feel I was that age! I 3 a club and trained weekly. Each day I felt my physical energy 4 and, along with it, my confidence (信心). Then Suzanne pointed out, "Ws good, but how can you clear away the 5 of height?" "I've got it all worked out," I replied bravely. "We're going to the indoor climbing centre." While I was going up the high wall, I was afraid to look down as if a terrible animal was after me. Some time later, as I reached the ground, I sat down 6 on the floor. Later that night, as I lay in bed, I encouraged myself, "You had climbed the wall! You will certainly make it!" We set off with our packages to the Grand Canyon. When we reached it, I found the canyon was a huge black hole-far 7 than I had imagined. As the guide clipped (夹住) me onto the rope, my heart 8 double-time and I wondered why I had got myself into this. Time lost all meaning 9 I pushed my body forward. Only the strong rope kept me from 10 hope. I began to think it would never end when everyone had stopped. "This is as far as we go, and we can climb out after a few steps," the guide said finally. Two and a half hours later, we returned to the car park at last. I began to shake, one hard step after another. Getting onto the bus, I 11 into the seat I had left so confidently a lifetime before. Then, while I was in the seat catching my breath, a feeling of great happiness spread 12 me. I had done it, at 66 years of age. | ||||
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