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问题 单项选择题

水闸运行总结报告一般指一年或者一个汛期内的水闸（）加以总结，分析和研究，肯定成绩，找出问题，提出建议。

A、汛前检查工作

B、汛后检查工作

C、设备故障情况

D、运行工作

答案

参考答案：D

改错题

短文改错

       假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。

文中共有10处语言错误。错误涉及一个单词的增加、删除或修改。

       增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。

       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）不记分。

     In my village children are left school for various reasons. Some families are so poor to send their

children to school, and they had to earn money to support their families. Many parents do not think

them useless to send their children to school. They would rather let their children staying at home. I

feel worried this. I think every of child should have a chance to go to school . We should pay attentions

to the education of children, for we will play an important part on our socialist construction in the future.

Ways must be found prevent children from leave off their studies.

                                                                                                                                                          

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单项选择题

频率为100Hz，传播速度为300m/s的平面简谐波，波线上两点振动的相位差为π/3，则此两点相距（）m。

A．2

B．2.19

C．0.5

D．28.6
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