【名词&注释】
甲状腺(thyroid)、皮肤病(dermatosis)、持续性(persistence)、细胞内(intracellular)、肝功能损害(liver function damage)、视觉性(sense of vision)、角蛋白纤维(keratin fiber)
[单选题]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.
A. D