若直线y=k(x+1)与半圆x2+y2=1(y≥0)相交于P、Q两点,且∠POQ=150°(其中O为原点),则k的值为( )。
---- Did you see the hit New Year’s movie --- If You Are The One (非诚勿扰) last night ?
---- Yes, but when I got to the movie theater , the film ________ for ten minutes .
A.had begun
B.had been on
C.has been on
D.began
不属于抗抑郁药的是()
A.丙米嗪
B.马普替林
C.苯乙肼
D.溴隐亭
E.曲舍林