下列项目中，属于非流动负债的有（）。

A.长期借款

B.应付债券

C.短期借款

D.应付职工薪酬

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 alinear transmission medium, or bus. Full-duplex operation between the station and the tap allowsdata to be transmitted onto the bus and received from the （3）. A transmission from anystation 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 thebus.

（5）是（）

A.tap

B.repeat

C.terminator

D.concentrator