光纤的色散大致分为模式、材料、波导色散三种，但对单模光纤来说，影响最大的是（）。
A.色散
B.模式
C.材料
D.波导
参考答案：B
________the training of the FDS company，Jackson Sharoff was offered an important position in management.[ ]
A．Receiving
B．Having received
C．Having been received
D．Received
劳动争议诉讼中的（），当事人之间对某一民事法律关系无争议。
A.变更之诉
B.调解之诉
C.给付之诉
D.确认之诉
