我国自主研发的“中华牌”月球车将在2013 年送上月球，该月球车装有6 个宽大的车轮，这种设计是为了减少车辆对地面的______________。
压强
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（2）处应选择（）
A.processing
B.switching
C.routing
D.interfacing
以下选项中属于行政违法行为的是（）。
A.抢劫银行巨款违反了刑法
B.欠债不还违反了民事法律法规
C.中学生不穿校服参加升国旗仪式违反了校规
D.扰乱公共秩序违反了治安管理处罚条例
