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【单选题】
电子商务所包含的内容非常广泛,根据不同的标准有不同的分类方法。若按所使用的网络类型分类,可分为________A.
分别基于EDI、Internet和Intranet/Extranet的电子商务
B.
分别基于互联网、B-C和B-B的电子商务
C.
分别基于互联网、EDI和无形商品(可网上服务)的电子商务
D.
分别基于网络应用层、网络传输层和网络互联层的电子商务
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A.
Most workers will nottake an afternoon nap.
B.
Workers will workharder to compensate for the nap.
C.
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D.
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A.
层递
B.
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D.
反复
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A.
the first and second
B.
the first and third
C.
the first and fourth
D.
the third and fourth
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