牵出进路上设置有反向的并置调车信号机或差置调车信号机时，存在中途折返解锁的第二种情况。
参考答案：错
— Sorry, I’m late. Has the film begun?
— It doesn’t matter. The film _________ for several minutes.
A．has just begun
B．has just been over
C．has just been on
D．has just ended
扁桃体的生理功能正确的是()
A．呼吸功能
B．吞咽功能
C．消化功能
D．免疫功能
E．共鸣功能
