气象雷达的作用是()
A、探测空中的雷雨和风切变
B、探测雷雨和地面大型水面
C、探测雷雨和飞机
D、探测空中有水分的气象目标和大型地面目标或强对流气流
参考答案:D
________to the victims of the earthquake, you can contact the local charity organizations.
A.Contributing
B.To contribute
C.Being contribute
D.Contributed
胸部CT增强扫描时扫描延迟时间为()
A.10s~15s
B.20s~25s
C.30s
D.40s~50s
E.60s