A:①②③
B:①②④
C:①③④
D:②③④
- What do you know about kite surfing?
- It is _________ exciting water sport.
请简要说明下列操作可能造成的不良后果
①倾倒细口瓶的药液时,标签没向着手心____②向燃着的酒精灯添加酒精____③滴管取用试剂后平放或倒置____