【单选题】When it is the first time for you to meet someone, what should you greet him/her? _________
【单选题】When you greet a visitor in your office, do you:
A.
say nothing and let her sit where she wishes?
B.
tell her where to sit?
C.
say "Just sit anywhere"
【单选题】64S型半自动闭塞接车站值班员办理到达复原,接车站复原,黄灯熄灭,发车站不能复原的原因是( )。