【单选题】
在METAR报电码中,NSC表示:()
A、天气无重大变化
B、天气有重大变化
C、无重要的云
D、无重要的天气系统
A、天气无重大变化
B、天气有重大变化
C、无重要的云
D、无重要的天气系统
A、NSC operates at the file level. B、NSC operates at the byte level. C、NSC uses hard drives to store longer patterns. D、NSC retains learned patterns for a longer time. E、NSC is available only on platforms with dual hard drives.