A:蜡烛放置在距离透镜2.5cm处
B:蜡烛放置在距离透镜10cm处
C:蜡烛放置在距离透镜12.5cm处
D:蜡烛放置在距离透镜25cm处
I visit some museums last week.
三角形中,到三边距离相等的点是( )
一Don't worry about your trip to the US. I'll be with you all the way.
一OK. Thank you. It'll be my first time to travel abroad.