406MHZ卫星示标具有（）功能
A.定位
B.报警
C.接收MSI
D.A和B
参考答案：B
He had a wonderful childhood, _____ with his mother to all corners of the world. [ ]
A. travel
B. to travel
C. traveled
D. traveling
治安行政管理工作的主要任务是打击违法犯罪，查处治安案件，组织群众治安力量，维护社会治安秩序。( )
