A:Because I didn’t hug him as usual.
B:Because I didn’t drink the juice as usual.
C:Because he wanted to tell me something.
D:Because he wanted me to stay for a while.
What does it say?
一束光线自点P(﹣1,1,1)发出,被yOz平面反射到达点Q(﹣6,3,3)被吸收,那么光线所走的距离是( )