I thought you would come on time yesterday, but you left me ____ (wait) for nearly half an hour.
- There a basketball game in our school tomorrow.
- Great!
用频率估计概率,可以发现,抛掷硬币,“正面朝上”的概率为0.5,是指( )
第一次世界大战前形成的帝国主义两大军事侵略集团的核心是( )