a.m.的含义是

听力原文： Attention passengers. The 6:50 A.M. nonstop express train from Union Station Was

—I’d like a wake－up call at 7:00 a.m. please!—OK

代码是用来表征客观事物的实体类别 分为有含义码和无含义码 其中有含义码又分为()

______ asked ______ to call at 7667338. A Telephone Message From: Zhang Wei To: Li Qiang Date: January 9th Time: 10:30 a.m. Message: Your friend Zhang Wei called you just now. He asked you to call him

VPN的中文含义是() WLAN的中文含义是()。

图例▲的含义是______ 图例的含义是______.图例▲的含义是______ 图例 的含义是______.