A:2
B:12
C:-12
D:-2
- Do you know Victory Day in China?
- Yes, it's _______ September 3rd _______ each year. It tells the world that Chinese people love peace and hate wars. Chinese people will never forget the history.
If you see any litter on the school playground, you'd better _______.
如果将同一个鸡蛋先后放入密度分别为ρ甲、ρ乙的两杯盐水中,鸡蛋静止时的状态如图所示,所受的浮力分别为F甲、F乙,下列判断正确的是( )