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

两相似三角形面积比为1：3，则应对应中线的比为______．