工作任务不能按批准完工期限完成时，工作负责人一般应在批准完工期限前（）h向工作许可人申明理由，办理延期手续。
A、2
B、3
C、4
参考答案：A
Mrs. Brown was much disappointed to see the washing machine she had had ________ went wrong again.
A．it
B．it repaired
C．repaired
D．to be repaired
GGSN产生的CDR是（）
A.S-CDR
B.M-CDR
C.G-CDR
D.S-SMT-CDR
E.S-SMO-CDR
