【单选题】
在OSI参考模型中，网络层、数据链路层和物理层传输的数据单元分别是___。
A. 报文、帧、比特
B. 分组、报文、比特
C. 分组、帧、比特
D. 数据报、帧、比特
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答案
C
解析
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D. 营运资金＝长期负债＋所有者权益－流动负债
