— I'll go to Hainan with my parents fo r the winter holiday next week.
— Really? ______________!
A:Have a good time
B:Best wishes
C:Congratulations
D:That's great
“We will learn ______ English words this year,” the teacher said to the students.
实验
次数
钩码重/N
钩码上升的
高度/m
绳端的
拉力/N
绳端移动的
距离/m
机械效率
1
4
0.10
1.8
0.3
2
6
2.5
3
0.15
通过精确测量发现,地球是一个( )