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Among the following basic features(or properties) of the data link layer, which is the wrong description

A、Adjacent high layer is the network layer
B、Data link can be established after the physical connection is released
C、Adopting the method of error control and flow control to make the physical line with errors become the physical link without errors
D、The data transmission unit of the data link layer is a frame
喵查答案:Data link can be established after the physical connection is released

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