A:if I knew
B:had I forgotte
C:if I hadn’t remembered
D:but I forgot
The teacher as well as the students who_____fond of football,_____ playing together.
市场上出售一种装有太阳能电扇的帽子,在太阳的照射下,小电扇快速转动,能给炎热的夏季带来一丝凉意,装置的能量转化情况是( )
在区间0,π上随机取一个数x,则事件 “sinx≥cosx”发生的概率为( )