根据观测结果,已建立Y关于X的回归方程Y=2.0+3.0X,则X变化1个单位,Y平均变化单位个数为()
A.1
B.2
C.3
D.4
E.5
参考答案:C
By the time the new pupil ___ enough courage to raise his hand, the bell__ for the end of the lesson
A.had gathered…was already ringing
B.was gathering…had already rung
C.gathered… had already rung
D.would gather… have rung
在与发行人有密切联系的公司中担任董事或监事的人员不属于内幕人员。( )