隐匿性乳突炎
参考答案:
隐匿性乳突炎是指急性乳突炎虽获治疗,但由于抗生素用量不足或治疗不彻底,乳突炎性病变继续发展,而全身及局部症状却不明显,以致不易发现,称隐性乳突炎。
出出版单位或批发企业将出版物的样本集中,以召开订货会的方式,邀请零售部门的进货人员选订,这种进货方式是()。
Both bus and tree topologies are characterized by the use of multipoint (71) .For the bus,all stations attach,through appropriate hardware (72) 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 (73) .A transmission from any station propagates the length of the medium in both directions and can be received by all other (74) .At each end of the bus is a (75) ,which absorbs any signal,removing it from the bus.
A.tap B.repeater C.terminator D.concentrator