胎儿娩出后胎盘30min仍不娩出，称为
A．第二产程延长B．活跃期延长C．滞产D．胎盘滞留E．潜伏期延长
参考答案：D
数据维护是指( )。
A．数据内容的增加，数据结构的调整
B．数据备份与恢复
C．主体业务数据的定期正常更新，以及数据的不定期更新
D．以上都是
__________ I can see, there is one possible way to keep away from the danger.[ ]
A. As long as
B. Just as
C. As far as
D. Even if
