Both bus and tree topologies are characterized by the use of multipoint（）．For the bus，all stations attach，through appropriate hardware（）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（）．A transmission from any station propagates the length of the medium in both directions and can be received by all other（）．At each end of the bus is a（），which absorbs any signal，removing it from the bus．

Both bus and tree topologies are characterized by the use of multipoint（）．

A．medium

B．connection

C．token

D．resource

修改下雨中中间画的时候的雨点大小、数量、密度、位置等要和原画保持一致。