数据库技术的奠基人之一E.F.Codd于1970年发表过多篇论文，主要论述的是( 发布时间：2018-01-16 12:26 │ 来源：www.tikuol.com 题型：单项选择题 问题： 数据库技术的奠基人之一E.F.Codd于1970年发表过多篇论文，主要论述的是( )。A．层次数据模型B．网络数据模型C．关系数据模型D．面向对象数据模型
题型：单项选择题 根据短文内容，用方框中所给词语的适当形式填空，使文章通顺、完整。（每词限用一次） turn, better, give, she, scared, visit, close, open, but, everyone In a happy town there lived a little, beautiful and smart girl, and (1)_______ name was Rose. (2)_______ in the town liked her. She was so brave, but one thing she was scared of was the doctor. One day her tooth was moving. Her mum saw it. She said,"Your tooth is moving, and you need to (3)_______ Doctor Tim." Rose said, "No! I am not going to the doctor." Mum said, "Don't worry. It's not so wobbly (摆动的) now." That made Rose feel (4)_______. After five weeks, Rose forgot about her tooth (5)_______ her mum didn't. She checked her tooth again and it was wobbly, so she said, "It's time to see the doctor." Rose was (6)_______ but she had to do what her mum told her, so they went to see Doctor Tim. They had to wait in the waiting room. When it was her (7)_______, her heart was bumping (碰撞) very fast. She went into Doctor Tim's room. He was smiling. She sat on the chair. Doctor Tim said, "(8)_______ your eyes." Rose closed her eyes, but just before Doctor Tim started, tears started coming down her eyes. But when she (9)_______ her eyes, she saw Doctor Tim holding her tooth. Rose smiled. Then Doctor Tim (10)_______ her a teddy bear (泰迪熊) and from that time Rose wasn't scared of doctors any more. 查看答案
题型：单项选择题 患者男性，50岁，突发心悸2小时来院。入院后神志不清，血压测不出，查心电图示：宽大畸形QRS波群心动过速，QRS波振幅和波峰方向呈周期性改变，围绕等电位线扭转，诊断为（）。A.室上性心动过速伴室内差异性传导B.预激综合征伴心房颤动C.阵发性室性心动过速D.加速性室性自主心律E.尖端扭转型室性心动过速 查看答案