我国票据法中没有______。
A．汇票参加关系
B．背书关系
C．付款关系
D．保证关系
E．本票见票关系
参考答案：A,E
—Look at the old lady in red. Is that Mrs. Lee?
—No, it _______ be her. She has gone to Canada. [ ]
A. won't
B. mustn't
C. can't
D. shouldn't
SDH设备常见的网元类型是：（）.
A.REG
B.DXC
C.TM
D.ADM
