【单选题】【消耗次数：1】
20世纪90年代之前，传输EDI的网络是（ ）
①
LAN
②
VAN
③
Internet
④
Extranet
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幼儿社会教育制度化、规范化
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转移向更为人本化与科学化的方向发展
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技术课程只在高等教育中开设
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