题干
- ______ is it going, Jane?
- It's great! I like the party so much.
A：What
B：How
C：Which
D：Where
答案(点此获取答案解析）
B
- ______ is it going, Jane?
- It's great! I like the party so much.
A：What
B：How
C：Which
D：Where
时刻的波形图，
是平衡位置为
处的质点，
是平衡位置为
处的质点，图乙为质点
