题目

阅读短文，回答问题：卡门涡街现象2020年5月5日，虎门大桥的桥体异常振动引发了大家的关注，专家认为这是由卡门涡街现象引起的。如图甲所示，在一定条件下，流体流过阻碍物时，会在阻碍物上下两侧先后交替产生有规则的反向旋涡①、②、③、④……，这一现象叫卡门涡街现象。产生旋涡的一侧流速快，另一侧流速慢，交替形成大小不同的压力，使阻碍物产生有规律的振动，即涡振。涡振频率f与阻碍物的特征宽度d和流体流速v有关，其关系 （k本文中共有10处语言错误,每句最多有两处.错误涉及一个单词的增加,删除和修改.增加:把缺词处加一个漏字符号(∧),并在其下面写出该词.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.每处错误极其修改均限一词.2.只允许修改10处,多者从第11处不记分.Mr. Smith had a 8-year-old son named Tony, who enjoyed listening to music very much. So he bought a piano to Tony, hoping that he can become a famous pianist one day. The little boy put her heart into practising the piano day after day and seemed enjoy every minute of it. However, half a year later, he told his father that he was tiring of practising the piano. Heard this, Mr. Smith said, “Tony, it is one thing to be fond of listen to music, but it is another thing to perform skillful by yourself. You can never play the piano well even if you don’t practise more.”