Dim year,t as integer
t=0
For year=1896 To 2016
t=t+1
Next year
该程序段结束后,变量year的值是( )
A:2016
B:2017
C:2016
D: "2017
过抛物线焦点F的直线与抛物线相交于A、B两点,若A、B在抛物线准线上的射影是A1、B1,则∠A1FB1等于( )