A:1.55×1010
B:1.55×1011
C:1.55×1012
D:1.55×1013
茶杯静止在水平桌面上,下列哪对力属于平衡力( )
China Dream is a great way to gather people together and ___ the fast development of our country.
实验次数
1
2
3
4
5
6
物质种类
相同
体积V/cm3
10
20
30
40
50
60
质量m/g
15
25