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问题 解答题

小明、小强两人的身高都约是1.6×102cm，但小明说他比小强高9cm。问：有这种可能吗？若有这种可能，试举例说明；若没有这种可能，试说明理由

答案

解：有可能；小明身高164cm，小强身高155cm。

实验题

如果把人当作一个整体来看，在水平方向的固有频率约为3 Hz—6Hz，竖直方向的固有频率约为4 Hz—8 Hz，拖拉机驾驶员和风镐、风铲、铆钉机等操作工在工作时将做___________振动，这些操作工的振动频率跟振动源的频率______________________.为保障操作工的安全与健康，有关部门作出规定：用手操作的各类机械的频率必须大于20 Hz，这是为了防止发生___________造成对人体健康的危害.
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改错题

短文改错。

     请你对下文内容进行修改。文章中共有10处错误，每句中最多有两处。错误涉及一

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

     Mark Twain was born in a small town of Horrid. When he is only twelve years old , his father died .

Late he became a river boat pilot . Mark Twain was her pen name .During the American Civil War he

worked as a reporter and write a lot of stories. Gradually he made his mark and his work were popular .

He became one of the best known writer of the 19th century in the U.S.A . In his life Mark Twain wrote

the number of stories and novels , of them  "Adventure of Tom Sawyer" is the most famous one . His

writings have  translated into many other languages ,and they are deeply loved by the readers all over in

the world .        

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