地陪导游人员在接团之前，应做好可能承受抱怨和投诉的心理准备。()
参考答案：对
There are some things in this world________cannot be expressed in the form of words. [ ]
A. what
B. which
C. where
D. when
哪中类型的帧用来确认数据接收（）
A.控制帧
B.应答帧
C.空帧
D.管理帧
