一分钟能干什么呀,什么事也做不成,所以我们不必在乎这小小的一分钟。( )
Jane's grandmother had wanted to write children's book for many years, but one thing or another always got in way.
下列命题是真命题的是( )
①必然事件的概率等于1 ②某事件的概率等于1.1 ③互斥事件一定是对立事件
④对立事件一定是互斥事件 ⑤在适宜的条件下种下一粒种子,观察它是否发芽,这个试验为古典概型.