A:﹣1
B:﹣2
C:﹣3
D:1
It's reported that there are more than 300 smokers in China, nearly a third of all the smokers in the world.
小猴在大象的____边,
小猫在小猴的____边。
用手握瓶子,使瓶子在竖直方向处于静止状态.如果握力加倍,则手对瓶子的摩擦力( )