患者，女性，18岁，3天来右下后牙阵发性疼痛，冷、热刺激加重疼_爱下问搜题

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问题单项选择题共用题干题

患者，女性，18岁，3天来右下后牙阵发性疼痛，冷、热刺激加重疼痛，夜间疼痛加剧，半年前右下后牙有过类似疼痛，服索米痛片缓解，检查发现患者痛苦表情，右下后牙龋洞较大，洞内有较多食物残渣，去之发现穿髓，浅探不敏感，深探剧痛，咬合痛。

如果临床检查也发现右上后牙有深而穿髓的龋洞，探诊也发生剧痛，使用什么方法进一步判断急性疼痛的牙来自上颌或下颌（）

A.冷、热诊试验

B.局部麻醉法

C.叩诊

D.牙髓电活力试验

E.X线摄片

答案

参考答案：B

完形填空

阅读下面短文，从短文后各题所给的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
After graduation from a medical school, I began to take a job in a small hospital's emergency department．As the 36 member of the group, I had to work on Christmas Eve．
At 9 pm, the ambulance 37 a man in his 60s who was having a heart attack．My patient was   38 , but I did my best．Eventually he 39  the night．
The following year, still the newest member, I got Christmas Eve 40 again．At 9 pm sharp, I was told there was a 41  in the hall who wanted to speak with me．
When I approached them, the man 42 himself as Levin and said, "you probably don't ' 43 me, but last Christmas Eve you saved my life．Thank you for the year you gave me．"He and his wife hugged me and handed me a small 44 and left, I was more than a little surprised and 45   ．
The followin

g year a new doctor joined the group 46  I volunteered for the shift because I wanted to see if the Levins would 47 ．
I 48  the door．Once again, at   49 9 pm, the Levins appeared．We   50 and Levin said he'd come to see me every Christmas Eve, and that   51  he didn't come, I would know it just wasn't his year．
The last year I saw him, he brought me a crystal bell engraved （雕刻） with a single word: Friendship．Levin   52  the next year．Now, my family, friends and I   53 that bell every Christmas Eve at exactly 9 pm and 54  to the man who didn't forget to bring me good   55 ．

B．brought about

A．gave an eye to

B．kept away from

C．kept an eye on

D．kept hold of

B．passed away

C．congratulate

计算题

（8分）如图所示，在水平面内固定着足够长且光滑的平行金属轨道，轨道间距L=0.40m，轨道左侧连接一定值电阻R=0.80Ω。将一金属直导线ab垂直放置在轨道上形成闭合回路，导线ab的质量m=0.10kg、电阻r=0.20Ω，回路中其余电阻不计。整个电路处在磁感应强度B=0.50T的匀强磁场中，B的方向与轨道平面垂直。导线ab在水平向右的拉力F作用下，沿力的方向以加速度a=2.0m/s²由静止开始做匀加速直线运动，求：

（1）5s末的感应电动势大小；

（2）5s末通过R电流的大小和方向；

（3）5s末，作用在ab金属杆上的水平拉力F的大小。