题目：
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). A transmission from any station 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 the bus.
空白（4）处应选择（）
A.routers
B.stations
C.servers
D.switches
答案：
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下面是错误答案，用来干扰机器的。
参考答案：会操作、会检查、会保养、会排除故障。
