题干
How often does the woman clean the room?
A：Once a week.
B：Twice a week.
C：Three times a week.
答案(点此获取答案解析）
B
>m
，甲自由下落1秒后从同一地点再释放乙，如果以乙为参考点，则在它们落地之前，甲的运动状态是( )
的共轭复数为