题目内容
抗原漂移属于质变，即亚型变异，变异幅度小或连续变异，通常由病毒基因点突变和人群免疫力选择性降低引起，易于发生小规模的流感流行。
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Dane颗粒：是有感染性的完整的HDV颗粒，电镜下呈双层结构的球形颗粒，直径42nm。
Negotiation is the process in which two parties with conflicting interests communicate to arrive at an agreement.
Market bargaining is the most complex context in negotiation.
Relationship is one of the priorities for Chinese negotiation team.
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