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问题
问答题 简答题
绘图题：简单画出GPRS的网络结构图以及主要的接口。
答案
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选择题
I have _____ him for fifteen years. But I didn't _____ him just now because he has changed so much.
A. known; recognize
B. recognized; know
C. known; know
D. recognized; recognize
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单项选择题
中国通信服务的企业标志被誉为中华文明之源、“宇宙魔方”的（）
A.《鬼谷子》
B.《河图洛书》
C.《营造法式》
D.《天工开物》
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