若方程组ax+y=02x+by=6的解是x=1y=-2，则a2+b2=_____ 发布时间：2017-04-15 13:12 │ 来源：www.tikuol.com 题型：填空题 问题： 若方程组ax+y=02x+by=6的解是x=1y=-2，则a2+b2=______．
题型：填空题 完形填空 Walking a few kilometers a day is normal. How about walking 30km? This is 1 students did at the Middle School Attached to Shangdong University in Jinan. The students there hiked about 30km from school to a local mountain and back. The school has heldhiking 2 since 2001, in order to 3 the students' bodies and minds, according to Zhao Yong, the headmaster. The trip 4 about nine and a half hours, and more than 700 Junior 2 students took part in the hike. The trip started at 7:30am and ended at 4:30pm on April 1. "I felt a strong team spirit during this 5 experience," said Li Yaoyu, 14, one of the flag bearers(旗手) of the hike. "When we fell behind others, strong students supported weak ones so that we could 6 thetrip. Some of them helped me 7 the flag. I wouldn't have been 8 to finish the trip without their help." On the way back to school, Shao Mingyang, an eighth grade student, couldn't go on with the trip because he was a little 9 . "We suggested that he take the school 10 or give up the trip, but he 11 and insisted(坚持) on walking by himself," said Wang Daoyuan, Shao's teacher. Shao came back to school at 5:05pm. He was the last to finish the hike. His classmates waited for him at the school gate and 12 for him. "I felt 13 for my students, especially Shao Mingyang. I'm happy to see them learn the 14 of perseverance(坚持不懈), which will be very 15 in their future lives," said Wang.( )1. A. what ( )2. A. lessons ( )3. A. check ( )4. A. cost ( )5. A. special ( )6. A. stop ( )7. A. protect ( )8. A. glad ( )9. A. fat ( )10.A. flag ( )11.A. complained ( )12.A. looked ( )13.A. sorry ( )14.A. lesson ( )15.A. colorful B. how B. examinationsB. build B. spent B. normal B. continue B. fetch B. ready B. nervous B. uniform B. refused B. welcome B. thankful B. skill B. important C. when C. activities C. mix C. began C. tiring C. enjoy C. carry C. safe C. strong C. dinner C. agreed C. cheered C. proud C. way C. educationalD. why D. games D. train D. lasted D. healthy D. test D. guard D. able D. careless D. bus D. wondered D. served D. hopeful D. meaning D. modern 查看答案
题型：填空题 关于超声波的表述，错误的是()A．频率大于20，000Hz的振动波B．在不同的介质中传播时速度不同C．在液体和气体中以纵波方式传播D．在人体软组织中的传播方式是横波E．在固体中有纵波、横波和表面波三种振动方式 查看答案
题型：填空题 患儿刘某，因发热3日到县医院就诊，门诊接诊医师张某检查后发现刘某的颊黏膜上有考氏斑，拟诊断为麻疹。张某遂嘱患儿刘某的家长带刘某去市传染病医院就诊。按照传染病防治法的规定，张某应当（）A.请上级医师会诊，确诊后再转诊B.请上级医师会诊，确诊后隔离治疗C.向医院领导报告，确诊后由防疫部门进行转送隔离D.向医院领导报告，确诊后对刘某就地进行隔离E.在规定时间内，向当地防疫机构报告 查看答案
题型：填空题 下列关于PDM的描述，错误的是（）。A.PDM技术是一门用来管理与产品相关的主要信息和主要过程的技术B.PDM进行信息管理是通过静态的产品结构和动态的产品设计流程C.PDM包括了产品生命周期的各个方面D.PDM是CAD/CAPP/CAM的集成平台 查看答案