“代替那存在着阶级和阶级对立的资产阶级旧社会的将是这样一个联合体，在那里，每个人的自由发展是一切人自由发展的条件”。《 * * 党宣言》中的这句话，阐述了[ ]

A．资本主义社会的基本矛盾

B．资本主义制度的腐朽本质

C．无产阶级斗争的政党学说

D．未来 * * 主义社会的原则

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).Atransmission from any station propagates the length of the medium in both directions and can be received by all other(4).At each end ofthe bus is a(5),which absorbs any signal, removing it from the bus．

空白（3）处应选择（）

A.tree

B.bus

C.star

D.ring