题型:选择题 As soon as the children _____ themselves in their seats in the classroom, the bell rang.A.satB.settledC.tookD.put 查看答案
题型:单项选择题 对航空器提供雷达管制服务的条件是()。A.该航空器已被识别确认B.在雷达覆盖范围内C.在航行情报资料中发布有关运行方法的资料及影响空中交通管制实施的有关设备要求D.A、B和C 查看答案