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问题 单项选择题

在某次旅游安全事故中，造成旅游者3人轻伤．经济损失3万元，属于( )。

A．轻微事故
B．一般事故
C．重大事故
D．特大事故

答案

参考答案：B

解析： 该题中事故造成经济损失3万元，介于1万元至10万元之间，故属于一般事故。

改错题

短文改错。

     请修改下面的短文。短文中共有10处语言错误，每处错误仅涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏词符号（^），并在此符号下面写出该加的词。

删除：把多余的词用斜线（\）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：

1. 每处错误及其修改均仅限一词。

2. 只允许修改10处，多者（从第11处起）不计分。

     When I was in high school, most of my friend had bicycles. I hoped I could also have it.

     One day I saw a second-hand bicycle, that was only one hundred yuan. I ask my father the

money. But he said he could only give me half of the money. He should find the other half myself.

     So I went to sell newspapers after the school. My father was pleased if I showed him the money

a month late. He gives me the other fifty. You can imagine how much happy I was when I rode to

school on my own bicycle.

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问答题

三个进程P1、P2、P3互斥使用一个包含N(N＞0)个单元的缓冲区。P1每次用produce()生成一个正整数并用put()送入缓冲区某一空单元中；P2每次用getodd()从该缓冲区中取出一个奇数并用countodd()统计奇数个数；P3每次用geteven()从该缓冲区中取出一个偶数并用counteven()统计偶数个数。请用信号量机制实现这三个进程的同步与互斥活动，并说明所定义信号量的含义。要求用伪代码描述。
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