磁场中磁力线越稀疏的地方磁场()。A、越强 B、越弱 C、与磁力线无关 D、为零 发布时间:2019-09-03 14:47 │ 来源:www.tikuol.com 题型:单项选择题 问题: 磁场中磁力线越稀疏的地方磁场()。A、越强B、越弱C、与磁力线无关D、为零
题型:单项选择题 Shows at the Palace MuseumThe Palace Museum is a wonderful place to visit. There are lots of fun and interesting things to see. Come to visit the Palace Museum.Closing Time Place Things to See10:00 a.m.Taihe PalaceGolden Throne10:30 a.m.Zhonghe PalaceWorks of Art11:00 a.m.Baohe PalaceWorks of Art1:00 p.m.Jingren PalaceBronzes(青铜器)1:40 p.m.Yonghe PalacePottery(陶器)2:30 p.m.Huangji PalaceChinese Paintings4:00 p.m.Fengxian PalaceClocks and watches Tickets:Adults:¥15.00Children:Over12: ¥10.00 Under12: Free(免费)Opening Time:9:00a.m.~ 4:00 p.m. 10:00a.m.~ 3:00p.m. on Saturday Not open on SundayNotices(注意):Keep quiet.Keep the museum clean.Don’t forget(忘记) to buy some souvenirs(纪念品)for your friends and family.Do not take any photos.Do not touch (触摸)anything.小题1:How many kinds of things can you see at the show ?A.FourB.FiveC.SevenD.Eight小题2:When can you see clocks and watches?A.At 1:40 p.m. from Monday to Saturday B.At 4:00 p.m. on SaturdayC.At 4:00 p.m. every dayD.At 4:00 p.m. from Monday to Friday小题3:Mr. Wu wants to visit the show with his two students this Saturday. The two students are both 14. How much are the tickets together?A.¥35.00B.¥28.00 C.¥15.00D.¥7.00小题4:The Palace Museum opens ________ days a week.A.TwoB.FiveC.Six D.Seven小题5:Which of the following can you do at the show?A.To talk to each other.B.To take a few nice photos.C.To buy some souvenirs.D.To touch golden throne. 查看答案
题型:单项选择题 (11分)地球质量为M,半径为R,自转角速度为,万有引力恒量为G,若规定物体离无穷远处势能为0,则质量为的物体离地心距离为时,具有的引力势能可表示为。(1)试证明一质量的卫星在离地面距离为时所具有的机械能为(2)国际空间站是在地球大气层上空绕地球飞行的一个巨大人造天体,设空间站离地面高度为,如果在该空间站直接发射一颗质量为的小卫星,使其能达到地球同步卫星轨道并能在轨道上正常运行,该卫星在离开空间站时必须具有多大的初动能。 查看答案