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问题 单项选择题

男，30岁，饱餐后突发上腹持续性疼痛2小时，体检全腹有压痛，腹肌紧张，肝浊音界消失。对其诊断最有价值的检查是

A．血常规检查 

B．腹部CT检查 

C．立位腹部平片 

D．血淀粉酶测定 

E．纤维胃镜检查

答案

参考答案：C

解析：C【解析】饱餐后突发上腹持续性疼痛，全腹有压痛，腹肌紧张，肝浊音界消失。应考虑胃肠穿孔。立位腹部平片见膈下游离气体可明确诊断。

改错题

短文改错

        假定英语课上老师要求同桌之间修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，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：在错的词下画一横线，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 a child, my mom pushed me to studying hard, hoping I could get a chance to go

to college. I experience pressure for the first time. I did that my mom expected because I didn't

want to make her disappointing. I was born in a poor peasants family, but I really knew life was

not easy. All the things my mother did was the result of her hope that I could lead better life in the

future. As the saying goes, "no pains, no gains." I was finally able to realize my mother's dream

and had a chance to go to college. Thanks to my mother's push and the pressure, I made them.

Now, I no longer think pressure is a worse thing.

                                                                                                                                                       

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问答题

如图所示，离地面足够高处有一竖直的空管，质量为，管长为

24m， M、N为空管的上、下两端，空管受到16N竖直向上的拉力作用，由静止开

始竖直向下做加速运动，同时在M处一个大小不计的小球沿管的轴线竖直上抛，小球

只受重力，取g=10m/s2.求：

小题1:若小球上抛的初速度为10m/s，经过多长时间从管的N端穿处.

小题2:若此空管的N端距离地面64m高，欲使在空管到达地面时小球必须落到管内，

在其他条件不变的前提下，求小球的初速度大小的范围.
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