Alright, now let's be serious. Actually-you'll take an exam today.

好了.不跟大家开玩笑了.其实--我们是今天考试.

The average level that can know a student to take an exam roughly according to these diagnostic index and histogram and distributinging compasses…

根据这些特征指标和直方图就能大致了解学生考试的一般水平和分布规…