38-17=____
48+52=____
46+28-13=____
图是以极地为中心的某半球气压带、风带分布示意图,箭头表示风向,图中ABC表示晨昏线。读图,完成题。
-I will go to the countryside to see my grandmother this afternoon, so I can't go swimming with you.
-___________.
测量对象
质量m/kg
G/N
比值g/N•kg﹣1
物体1
0.1
0.98
9.8
物体2
0.2
1.96
物体3
0.3
2.94