卫星按轨道高度分类有低轨道卫星，中轨道卫星，（）。A.高轨道卫星 B.倾斜轨道卫星 发布时间：2019-07-05 18:42 │ 来源：www.tikuol.com 题型：单项选择题 问题： 卫星按轨道高度分类有低轨道卫星，中轨道卫星，（）。A.高轨道卫星B.倾斜轨道卫星C.非同步卫星D.通信卫星
题型：单项选择题 阅读理解。 Mr. and Mrs. Brown have two children, Mike and Liz. The whole family are all busy, so they often leave notes (便条) for each other. Read these four notes of today and answer the following questions. ① 3:30 pm To Mike, Mr. Tyler rang. No football practice today. I'm going to Donna's house to play and be back at 5:00 pm Liz② 4:00 pm To Liz, It's your turn to walk the dog. I have to do my homework after school. Remember to play with Teddy when you get home! Mike ③ 6:45 pm Has anyone seen my tennis shoes? I'm in my bedroom doing my homework. Mike ④9:00 pm I saw your shoes this morning. They smelt terrible so I put them outside the back door. Good night, dears! Mum1. When will Liz be back home? A. At 3:30 pm. B. At 4:00 pm. C. At 5:00 pm. D. At 9:00 pm. 2. Who should walk the dog today? A. Mike. B. Mrs. Brown. C. Liz. D. Mr. Brown. 3. What is Mike doing at 6:50 pm? A. Practicing football. B. Going to Donna's house. C. Playing tennis. D. Doing his homework. 4. Where can Mike find his tennis shoes? A. In his bedroom. B. Outside the back door. C. In the living room. D. At Donna's house.5. According to the notes, Teddy is __________. A. Mike's mother B. Mike's brother C. Mike's football couch D. the dog in the family 查看答案
题型：单项选择题 小强周末从家里骑自行车去宜春明月山风景区玩，出发前，他盘算了一下：如果以每小时8千米的速度骑车，那么中午12点才能到达；如果以每小时12千米的速度骑车，那么上午10点就能到达。假设小强是早上x点从家里出发的，回答下列问题：（1）用含x的式子来表示小强家到宜春明月山的距离应为__________千米；（2）根据题目条件，请你求出第（1）问中的x的值；（3）如果小强想不快不慢正好上午11点到达，那么他骑车的速度应该是多少？ 查看答案