下列关于计算机中数的表示的叙述中，错误的是（）。A．正整数无_爱下问搜题

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问题单项选择题

下列关于计算机中数的表示的叙述中，错误的是（）。

A．正整数无论采用原码、反码或补码表示，其编码都相同

B．实数的浮点表示法由指数和尾数(含符号位)两部分组成

C．实数都能用浮点形式精确表示

D．整数也能用浮点数形式表示

答案

参考答案：C

解析：

实数可以用浮点数表示。浮点的表示范围虽然很大，但运算中还是可能出现超出它允许范围的一些结果，这种情况称为“向上溢出”。浮点数能表示绝对值很小的数，当运算中出现绝对值更小的数时，这种情况称为“向下溢出””，这时，处理器只能用0来表示。

完形填空

John Thomas was a student, but he had been a famous champion(冠军). Everybody at Boston University liked this tall, quiet boy. Once he was hurt, everybody at Boston University was      . People all over the country      about John Thomas and often asked, "Will he ever jump again?"
John's mother went to the hospital to see her son. She looked at his      leg. Then she looked into his     . She knew what her son would      . "You're going to jump again, John, I know it," she said."     will be all right."
If John hoped to jump again, he would have a     to do. He began at once. Even in his hospital bed John started to exercise. He used a wheel(轮子) and other metal things. Soon his     looked like a machine shop!
It was May when John      the hospital. "Is it all right if I go camping this summer?" he asked the doctors.
"Yes," the doctors said. "But take it easy on that foot."
John took only     walks at first. He was taking it easy on his foot. But not on anything else. He went swimming and did other kinds of exercises. He exercised        his body cried for a rest. Some days later, he exercised a little        . In late summer John went back to      . He asked if he could practise with the football team. Football wasn't his favorite, but he had to get that leg         again! He worked hard. "No one pushed him as hard as he pushed himself," said one of his friends. "To          a champion fighting back is a wonderful thing to watch."

单项选择题

档案室文件一般不允许借出借阅室，如有特殊情况，可以短期外借，外借时间最多为（）天。

A、10

B、7

C、5

D、3