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
，每秒钟输出10个光脉冲，每个脉冲持续的时间为 
，携带的能量为0.6J，则每个脉冲的功率为