A. Nice to meet you! John
B. Me, too.
C. Hi, Mike.
D. Nice to meet you, too!
E. Good morning!
F. My name is Amy.
政变发生后谭嗣同做了哪些事?
如图所示一根劲度系数k=200N/m的轻质弹簧拉着质量为m=0.2kg的物体从静止开始沿倾角为θ=37°的斜面匀加速上升,此时弹簧伸长量x=0.9cm,在t=1.0s内物体前进了s=0.5m.求: