若游客要求会见在华亲友，地陪应协助联系，一般不参加会见，也无充当翻译的义务。( )
参考答案：对
简述边撑的作用？
When deciding which project to select，（）．
A．select the project with higher life cycle cost
B．select the project with lower life cycle cost
C．select the project with higher sunk cost
D．select the project with lower sunk cost
