2015年我国预计发射5颗北斗导航卫星,北斗卫星导航系统按照“三步走”的发展战略稳步推进:2000年建成北斗卫星导航试验系统;2012年左右形成覆盖亚太大部分地区的服务能力;2020年左右形成全球覆盖能力。这体现了( )
①尊重客观规律按客观规律办事②发展是质变的必然结果
③量变是质变的必要准备④认识具有反复性无限性上升性
A:①③
B:①④
C:②③
D:②④
分析照片可知:
小球在做____直线运动(选填“匀速”或“变速”),其理由是:____.
Look at this. What's this in English, do you know? Ah, it's a photo. Who's that in the photo? It's Li Yan. Li Yan is my good friend. She is a beautiful girl. Who's that? The boy in black? It's Jim. He is an English boy. He is very cool. He is my friend, too. We are all in Class 3,Grade 7. I like Jim and Li Yan.