E-R图中包括三种基本图素。其中表示“联系”的图形符号是（） A. B. C. D. 发布时间：2018-06-05 07:28 │ 来源：www.tikuol.com 题型：单项选择题 问题： E-R图中包括三种基本图素。其中表示“联系”的图形符号是（）A.B.C.D.
题型：单项选择题 完形填空。 How are you? It is very nice 1 you to write 2 me. From your letter I know a lot 3 your school. Now I 4 you know something about me and my school. I am thirteen years old. I am in Class One, Grade One. My father is a 5 . He teaches English. My mother is a doctor. She works in a 6 . I 7 early and 8 English. Our school is big. It has 2,000 students and 200 teachers. All the teachers and students work 9 . Please come and have a look 10 our school if you have free time. ( )1. A. of ( )2. A. from ( )3. A. of ( )4. A. let ( )5. A. teacher ( )6. A. school ( )7.A. go to bed ( )8. A. look ( )9. A. hard ( )10. A. at B. on B. of B. for B. say B. worker B. hospital B. have lessons B. see B. hardly B. in C. for C. in C. about C. talk C. student C. factory C. get up C. watch C. careful C. on D. to D. to D. to D. know D. doctor D. hotel D. come here D. read D. fast D. to 查看答案
题型：单项选择题 下列事实能说明醋酸是弱电解质的是（ ）①醋酸与水能以任意比互溶；②醋酸溶液能导电；③醋酸稀溶液中存在醋酸分子；④常温下，0.1mol/L醋酸的pH比0.1mol/L盐酸的pH大；⑤醋酸能和碳酸钙反应放出CO2；⑥0.1mol/L醋酸钠溶液pH=8.9；⑦大小相同的铁片与同物质的量浓度的盐酸和醋酸反应，醋酸产生H2速率慢．A．②⑥⑦B．③④⑥⑦C．③④⑤⑥D．①② 查看答案
题型：单项选择题 西部大开发十年成就有______。A．国家不断加大对西部地区的支持力度，西部地区经济社会发展不断加快B．以基础设施、生态环境建设为突破口，西部地区发展的基础性问题开始得到解决C．坚持以人为本的指导思想，西部地区人民生活水平不断提高D．西部地区经济又好又快发展和社会和谐稳定E．以改革开放为动力，西部经济社会发展活力不断提高 查看答案
