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The receiving stations can use the B2 character to（）different, classes of messages.

A、identify

B、Correct

C、Reject

D、Print out

时间：2022-01-04 05:37 关键词： GMDSS

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Both bus and tree topologies are characterized by the use of multipoint (1).For the bus, all stations attach, through appropriate hardware (2) known as a tap, directly to a linear transmission medium, or bus. Full-duplex operation between the station and the tap allows data to be transmitted onto the bus and received from the(3). A transmission from any station propagates the length of the medium in both directions and can be received by all other (4). At each end of the bus is a (5) , which absorbs any signal, removing it from the bus.空白（1）处应选择（）
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